More information you will find in my selection of technical papers on sliderules.
Go to the search papers page.
Click on any Model in the list for its full specification/details OR hover over its "Thumbnail" (if shown) for a pop-up enlargements: | |||
---|---|---|---|
A.W. Faber | |||
Model | Type | Comments | Thumbnail |
(350) | Enhanced Mannheim | pre-runner to model 350 - cm scale in well of stock + INCHES to METER printed conversion scale on back |
![]() ![]() |
(364) | Enhanced Mannheim | pre-runner to model 364 + cm scale in well + table of constants & 2 cursor windows in back |
![]() ![]() |
(368) | Electro | pre-runner to model 368 & possibly first electro model by mainstream maker + V & W scales in well of stock + cm scale reversed + top & bottom edges bevelled |
![]() ![]() |
308 | Pocket Enhanced Mannheim | ![]() ![]() | |
308/S | Pocket Enhanced Mannheim | promotional rule for: Osnabrücker Kupfer- und Drachtwerk |
![]() ![]() |
332 | Pocket Mannheim | promotional rule for: La Ceramique Nationale |
![]() ![]() |
339 | Mannheim | “Made in Bavaria” on back |
![]() ![]() |
368 (ver. 2) | Electro | V & W scales, DR Patent 206428 & DRGM 271169 & 247514 in well of stock + top & bottom edges bevelled |
![]() ![]() |
373 | Lilliput Mannheim | inch scale on back |
![]() ![]() |
380 | Desktop Enhanced Mannheim | Gold lettering + cm scale in well of stock - INCHES to METER printed conversion scale on back |
|
51/39/339 | School Mannheim | Interim follow-on version of 339 before 51/39 came out |
![]() ![]() |
51/87 | Rietz | ![]() ![]() | |
51/91 | School Enhanced Mannheim | “Import” stamped in back |
![]() ![]() |
51/91/309 | School Enhanced Mannheim | Interim follow-on version of 309 before 51/91 came out |
![]() ![]() |
52/22 | School Business | many gauge marks above top DF scale |
![]() ![]() |
52/39 | Mannheim | unbranded but MARABU advertising logo (= reseller Marabuwerke AG, Tamm) printed on back |
![]() ![]() |
52/39/355 | School Mannheim | cursor possibly not original |
![]() ![]() |
57/22 | School Business | ![]() ![]() | |
Bitzer Kuelmaschinenbau | Pocket Refrigerant | Special commission for Bitzer Kuelmaschinenbau GMBH (still operating) - 1 of only 2 such Faber/F-C made SR’s with no slide - possible forerunner & inspiration for later Danfoss made models |
![]() ![]() |
A.W. Faber-Castell | |||
Model | Type | Comments | Thumbnail |
1/22 | Business - early | Pre 1958 version with 2-part British currency bottom edge scale (later combined scale) - table of conversion factors on back |
![]() ![]() |
1/22 | Business - late | Post 1958 version with combined British currency scale | |
1/22 | Business - late export | Post 1958 export (inch edge scale) version with combined British currency scale | |
1/22A | Business Addiator | British pre-decimal £sd bottom edge scales - conversion tables + Addiator on back |
![]() ![]() |
1/27 | Technical/Business | Only one its type made by F-C + instructions/table of constants on back & 2 cursor windows |
![]() ![]() |
1/28 | Super Business - late | Post 1958 version with combined British currency scale |
![]() ![]() |
1/44 EKAGNOST | Cardiology - System Dr. Sandera | German Registered Design (DBGM 1614435) by Dr. Robert Sandera to help cardiologists analyse printed electrocardiographs (ECG’s) from electrocardiogram machines of the day - innovative & clever reuse of Rietz-like scales - K.17 table of conversion factors + ECG correction formulas & constants on back - read more ... |
![]() ![]() |
1/48 | Machining - System Dr. Winkel | ![]() ![]() | |
1/54 (ver. 1) | Darmstadt | ||
1/54 (ver. 2) | Darmstadt | scale annotations + extra peripheral hairlines compared with ver. 1 |
|
1/54m | Darmstadt | Origin of model suffix m unknown |
![]() ![]() |
1/60 | Enhanced Mannheim | ||
1/60/360 | Enhanced Mannheim | ||
1/77 | System Pickworth-like | Uncommon model - cm scale in well of stock + conversion table on back + scale layout similar to 377 except K scale is not in back of stock but full-length on bottom edge | ![]() ![]() |
1/78/378 | Electro | hand-drawn K scale on stock + V & W scales in well of stock | |
1/87 (ver. 2) | Rietz | cm scale in well of stock |
![]() ![]() |
1/87 (ver. 3) | Rietz | ![]() ![]() | |
1/87/387 | Rietz | ||
1/87A | Rietz Addiatior | conversion tables + Addiator on back |
![]() ![]() |
1/87m | Rietz | cm scale in well of stock - origin of model suffix m unknown |
![]() ![]() |
1/92 | Log-Log | ![]() ![]() | |
1/94 | Rietz "Kiel" | "Kiel" comes from being the model favoured by German Imperial Naval Academy & School in Kiel & local retailer Johannes W. Janssen was known as a major outlet for slide rules to the local navy clientele + unusually for a Rietz has a Qo gauge mark - Tables of conversion factors & 2 cursor windows in back & see also Nestler 20F/3 Kiel |
![]() ![]() |
1/98 (ver. 1) | Electro | V & W scales in well of stock | |
1/98 (ver. 2) | Electro | V & W scales in well of stock |
|
1/98/398 | Electro | V & W scales in well of stock |
![]() ![]() |
11/54 | Darmstadt | ||
11/98 | Electro | V & W scales in well of stock | |
111/22 | Business | Two-part British pre-decimal currency scales |
![]() ![]() |
111/38 | Stadia Topography - 400g | ![]() ![]() | |
111/54 | Darmstadt | Original version without the later extra BI & ST scales |
|
111/54 | Darmstadt - late | Late model with extra BI & ST scales |
![]() ![]() |
111/54A | Darmstadt Addiator - late | Late model with extra BI & ST scales - Addiator on back |
|
111/66 (ver. 1) DEMEGRAPH | Printing - System Schirmer | For graphic design & follow-on replacement (converted DEMEGRPAH system & extra standard scales) for 2/66 - see also 20/66 SL typometer accessory for typewriter spacing |
![]() ![]() |
111/87 | Rietz | ||
111/87A | Rietz Addiatior | Addiator on back |
|
111/98 | Electro | Unusually the V & W scales are not in well but on front face. |
![]() ![]() |
12/82 | Technical/Log-Log Export | Only model in the series = inexpensive school version of 2/83N |
![]() ![]() |
152/81 | Technical two-tone | ![]() ![]() | |
152/82 (ver. CH) | School D-Stab | red & white insted of green & white colouring + MADE IN SWITZERLAND version |
![]() ![]() |
157/87 | School Rietz | ||
157/87 | School Rietz - black | monochorme (black) version | |
157/89 | Log-Log | ||
157/89 | Log-Log - black | monochorme (black) version |
![]() ![]() |
2/62 | Extra long Reinforced Concrete - System Dywidag | ![]() ![]() | |
2/66 DEMEGRAPH 13 | Printing - System Schirmer | Expensive (not a commercial success) model for graphical work according to a patented design (DE804932) by Max Schirmer + uncommonly wide body to accommodate the likes of vertical typographical scales on back + introduced with 20/66 typometer accessory & predecessor to 111/66 |
![]() ![]() |
2/82 | Technical/Log-Log | See also later 2/82N sibling |
![]() ![]() |
2/82N | Technical/Log-Log | See also earlier 2/82 sibling - model suffix N denotes new/advanced variant |
![]() ![]() |
2/83 | Technical/Log-Log long-scale | Green plastic rather than steel end-braces |
![]() ![]() |
2/83N | Technical/Log-Log long-scale | Impressive 30+ scales including a unique combined D & LL0 scale - model suffix N denotes new/advanced variant |
![]() ![]() |
2/84 | Mathema Hyperbolic | Designed by Dr. Eugen Moeller & only hyperbolic model F-C made + unusually extra gauge points placed on side edges of cursor |
![]() ![]() |
20/45 Bio-Rhythmograph | Biology | For calculating biorhythms (rhythmic physical, emotional & intellectual cycles) - popular 1970s pseudoscience developed by German Wilhelm Fliess based on individual’s date of birth + mechanism cleverly built into model 2/83 style plastic box |
![]() ![]() |
20/66 DEMEGRAPH | Typometer printing | Didot 6-14 point print system accessory introduced with 2/66 DEMEGRAPH 13 |
![]() ![]() |
20/66 SL DEMEGRAPH | Typometer printing | Didot 6-14 point print system accessory to F-C 111/66 System Schirmer - model suffix SL denotes German Schreibmschine Laeufer |
![]() ![]() |
20/68 Parifix | Conversion | slide rule style but a conversion table with cursor |
![]() ![]() |
20/70 | Universal/Technical | Copyrighted design targeting fuel economy by Dieter von Jezierski while director of F-C in attempt to stall F-C’s waning interest in producing slide rules |
![]() ![]() |
3/11 | Desktop Structural Engineering | special tables on back |
![]() ![]() |
3/31 | Desktop Reinforced Concrete | Nomogram on slide and scales in well of stock |
![]() ![]() |
300586 S Waldner | Wallet Pocket Rietz (67/87) | Wallet black on the outside (suffix S = “Schwarz” ) but grey on inside - most wallets, etc were promotional company branded gifts e.g. for German laboratory & science classroom supplier: Waldner |
![]() ![]() |
310/52 | Demonstration OHP School D-stab/Log-Log | Overhead projector version for model 52/82 |
![]() ![]() |
310/87 | Demonstration OHP School Rietz | Generic overhead projector version for Rietz models |
![]() ![]() |
310/88,89 | Demonstration OHP School Rietz-N/Log-Log | ![]() ![]() | |
334/52 | Demonstration School D-Stab/Log-Log | Classroom version of model 52/82 |
|
334/87 | Demonstration Rietz | Classroom version for all models with Rietz scale layout |
|
342 (ver. 2) | Desktop Columbus Business long-scale - System Rohrberg | Co-branded (box & rule) with KLAWUN + 1st F-C specialist rule for Merchants - extra wide body |
![]() ![]() |
344 | Rietz-like | cm scale in well + table of constants & 2 cursor windows in back |
![]() ![]() |
360 (ver. 1) | Enhanced Mannheim | Railway track scales |
![]() ![]() |
360 (ver. 1) | Enhanced Mannheim - early | Railway track scales + cm scale in well of stock | |
360 (ver. 2) | Enhanced Mannheim | ||
360 (ver. 3) | Enhanced Mannheim | wider cursor than other 360s |
![]() ![]() |
361 | Mannheim (double bevelled-edged) | cm scale reversed + top & bottom edges bevelled - read more ... |
![]() ![]() |
361 (ver. 1) | Mannheim | Railway track scales | |
361 (ver. 2) | Mannheim | ||
363 | Enhanced Mannheim | cm scale in well of stock + MADE IN BAVARIA on both box & stock | |
367 | Enhanced Mannheim | No cm scale in well of stock - metal strips |
![]() ![]() |
369 | Pocket Enhanced Mannheim | Two open windows with cursor line in back |
|
375 (ver. 1) | Rietz | Railway track scales | |
375 (ver. 2) | Rietz | ||
378 | Electro | V & W scales in well of stock |
|
379 | Pocket Electro | V (coloured red) & W scales in well of stock + no “W” gauge mark + electro conversion table on back - see earlier sibling here ... |
|
379 | Pocket Electro - early | V & W scales in well of stock + electro conversion table on back - see later sibling here ... |
![]() ![]() |
385N | Desktop Rietz | Popular desktop model + table on constants & 2 cursor windows in back |
![]() ![]() |
387 | Rietz | cm scale in well of stock | |
389 | Lilliput Enhanced Mannheim | 2 cursor windows in back |
![]() ![]() |
392 | Log-Log | “Made in Bavaria” + table of conversion factors on back on back |
![]() ![]() |
398 | Electro | V & W scales in well of stock + short temperature scale on B |
![]() ![]() |
4/22 | Desktop Business | Cursor not shown in image - conversion table on back |
![]() ![]() |
4/38 | Desktop Stadia Topography - 360g | ||
4/54 | Desktop Darmstadt | No blind date stamp - coversion tables & factors on a plastic book-mark |
![]() ![]() |
4/54 | Desktop Darmstadt - early | Conversion tables & factors on back |
|
4/60 | Desktop Enhanced Mannheim | 6 slide tension adjustment screws in bottom edge + table of conversion factors on back with 2 cursor windows |
|
4/87 | Desktop Rietz | ||
4/92/382 | Desktop Log-Log | 3-digit model no. suffix was added as the 3/xx series transitioned into the 4/xx series + 6 slide tension adjustment screws in bottom side edge + table of conversion factors on back with 2 cursor windows |
![]() ![]() |
4/98 | Desktop Electro | V & W scales in well of stock |
![]() ![]() |
44/87 | Desktop Rietz | Part of unusual limited series made from high pressure laminated (HPL) wood with metal inserts - patent no. DE892693 |
![]() ![]() |
52/80 | Mentor two-tone | ![]() ![]() | |
52/81 | Technical | ![]() ![]() | |
52/81 (ver. CH) | Technical | MADE IN SWITZERLAND version |
|
52/82 | School D-Stab/Log-Log | No BI scale - possibly an interim scale layout |
![]() ![]() |
52/82 | School D-Stab/Log-Log - early | Extra BI, LL1, S’ & P scales only added to an later (?) version |
![]() ![]() |
52/82 (ver. CH) | School D-Stab/Log-Log | MADE IN SWITZERLAND version with extra BI scale |
|
57/22 | School Business two-tone | ![]() ![]() | |
57/22W | Pipe Flow | Special commission for Spanish company Fibrotubo for calculating the flow in asbestos-cement pipes but unusually has a standard F-C model number in the 5x/xx series but significance of W model number suffix unknown + design probably by Fibrotubo + formulas on back |
![]() ![]() |
57/67 (ver. 2) | Philips - meteorology (dew point & humidity) | Unmarked - Philips no.: Z9.151.98 |
![]() ![]() |
57/69 | Central Heating Capacity | Patented design (NL81186) for calculating optimum capacity for central heating systems was part of a Dutch heating industry course: Stichting Vakcursus Verwarmingsartikelen En Kookapparatenhandel |
![]() ![]() |
57/74 (ver. 1) | Textile - System Schirdewan metric | Original metric version with unique A’ scale - read more ... |
![]() ![]() |
57/74 (ver. 2) | Textile - System Schirdewan imperial | A’ scale from version 1 replaced by LL + wider Imperial version cursor + cm scale on back - read more … |
![]() ![]() |
57/74 (ver. 2) | Textile - System Schirdewan metric | A’ scale from version 1 replaced by LL + inch scale on back - read more … |
![]() ![]() |
57/86 | Columbus Mannheim | narrow |
![]() ![]() |
57/87 | School Rietz | ||
57/88 | School Rietz-N | ||
57/88 (ver. CH) | School Rietz-N | MADE IN SWITZERLAND version |
|
57/89 | School Log-Log | ![]() ![]() | |
57/92 | School Log-Log | ![]() ![]() | |
61/60 | Pocket Enhanced Mannheim | ||
61/60/369 | Pocket Enhanced Mannheim | ||
62/82 (ver. 1) | Pocket Technical/Log-Log | ![]() ![]() | |
62/82 (ver. 2) | Pocket Technical/Log-Log | ![]() ![]() | |
62/83 | Pocket Technical/Log-Log long-scale | See later 62/83N sibling |
![]() ![]() |
62/83N | Pocket Technical/Log-Log long-scale | See earlier 62/83 sibling - model suffix N denotes new/advanced variant |
![]() ![]() |
63/22 | Pocket Business | ![]() ![]() | |
63/22R | Pocket Business Addiator | British pre-decimal £sd bottom bevelled edge scales + addiator pen clip part of stock - AddiatoR on back |
![]() ![]() |
63/39 | Pocket Mannheim | ||
63/54 | Pocket Darmstadt | ||
63/87 | Pocket Rietz | 1 cursor window in back |
![]() ![]() |
63/87R | Pocket Rietz Addiator | addiator pen clip part of stock - AddiatoR on back |
![]() ![]() |
63/91 | Pocket Enhanced Mannheim | promotional rule for: Atlas Diesel | |
63/98 | Pocket Electro | ||
66/92 | Pocket Log-Log | inexplicably rare model + Inch scale on back |
![]() ![]() |
67/22 | Pocket Business | for pre-decimal British £sd |
![]() ![]() |
67/22Rb | Pocket Business Addiator | for pre-decimal British £sd - AddiatoR on back - model suffix b denotes broader/wider stock |
![]() ![]() |
67/34 (ver. 2) | Pocket Hermatology - System Dr. Vogel | Specially for haemoglobin/blood analysis |
![]() ![]() |
67/39 | Pocket Mannheim | ||
67/54 | Pocket Darmstadt | Bayer branding on back |
|
67/54b | Pocket Darmstadt | model suffix b denotes broader/wider stock |
|
67/54R | Pocket Darmstadt Addiator | AddiatoR on back |
![]() ![]() |
67/54Rb | Pocket Darmstadt Addiator | Special IM1997 version - AddiatoR on back + model suffix b denotes broader/wider stock |
![]() ![]() |
67/54Rb | Pocket Darmstadt Addiator - Export | Henderson, Lindsay& Michaels Inc. (Greenville B.C.) stamped on back of pouch - AddiatoR on back + model suffix b denotes broader/wider stock |
![]() ![]() |
67/56b | Pocket Welding - Schweisstechnik, System Titscher | Specially developed for welders + related formulas the back |
![]() ![]() |
67/74 BASF | Pocket Pigment-Volume-Concentration | Special commission for German chemical company BASF but unusually has a standard F-C model number in the 6x/xx series + table of pigment thicknesses on back |
![]() ![]() |
67/87 Artos | Pocket Rietz | ||
67/87 SKF | Pocket Rietz | ||
67/87R | Pocket Rietz Addiator | AddiatoR on back |
![]() ![]() |
67/91 | Pocket Enhanced Mannheim | model no., etc printed on back because of advert in well of stock |
|
67/98 (ver. 1) | Pocket Electro | V and W scales in the well of the stock + “import” stamped in back |
![]() ![]() |
67/98 (ver. 1) | Pocket Electro - imperial | V and W scales in the well of the stock |
![]() ![]() |
67/98b | Pocket Electro | model suffix b denotes broader/wider stock |
![]() ![]() |
67/98Rb | Pocket Electro Addiator | AddiatoR on back - model suffix b denotes broader/wider stock |
![]() ![]() |
74/39 | Lilliput Enhannced Mannheim | Part of strange Lilliput-only series |
|
77/91 | Lilliput Enhanced Mannheim | 42nd Wedding Anniversary present from Ros - part of strange Lilliput-only series |
|
8/10 | Rietz | 1 of only 8 circular production models F-C made |
![]() ![]() |
8/12 DELBAG | Pipe Flow | For calculating resistance in metal pipes - 1 of only 8 circular production models F-C made |
![]() ![]() |
8/168 | Petroleum | Advertising model Mobil Oil Co. & for showing relationship between different viscosity measuring systems at given temperatures + weight to volumes conversion table on back - 1 of only 8 circular production models F-C made |
![]() ![]() |
8/20 | Pocket Basic | 42nd Wedding Anniversary present from Ros - 1 of only 8 circular production models F-C made |
|
8/30 | Pocket Retail | Outer scale is for calculating a % discount or % surcharge - 1 of only 8 circular production models F-C made |
![]() ![]() |
BASF Tonband-Schmalfilm-Rechner | Pocket Home Audio & Cine Film - System Schirmer | Specially commissioned reused 67/22b body for German chemical company BASF - 8mm & 16mm frames/minute nomogram on back - is this Schirmer same as Demegraph Max Schirmer? |
![]() ![]() |
ESSO Viskositat V.I. 70-80 | Petroleum | Specially commissioned by US global oil major ESSO for viscosity related calculations + Conversion tables on back |
![]() ![]() |
Heine Realzeitscheibe | Desktop Network Planning | Specially commissioned by Georg Heine, Stuttgart + front disc doubles as erasable notepad |
![]() ![]() |
Hel (ver. cme) Richtschieber A | Military Artillery Range Finder | cme = F-C secret WWII code for being made by Wichmann in Berlin - Eagle stamped in well signifying German military authorities - notches top & bottom either end of slide & 4 ball bearings in well stop slide accidentally falling out + plastic stops either end of bottom edge to stop cursor sliding off |
![]() ![]() |
Laukhuff Orgelpfeifen | Desktop Music Organ Pipes - System Rensch | Specially commissioned by German organ builder Laukhuff (still operating) for scaling organ pipes (wood/metal flues & reeds) based on copyrighted design by German Richard Rensch (1923-1997) but preceded by German Wolfgang Adelung’s earlier (simpler) version - extremely complicated to use (cursor extension + graph paper needed for interim calculations) - superb quality but only 500 ever made - Orgelbau-Verlag started selling their own (inferior) version in 1986 |
![]() ![]() |
Nijgh & Van Ditmar | Technical | Unbranded special commission for Dutch publisher Nijgh & Van Ditmar (founded in 1843 & still operating) - standard scale layout but for folded scales - reputedly complemented a book on calculating tips & tricks (incl. folded scales speeding up certain calculations) - pictograms on back same as model 57/86 |
![]() ![]() |
Peddinghaus Stanz- und Schnittkraft | Pocket Steel punching & cutting forces | Specially commissioned by German specialist steel plate supplier Peddighaus (still operating) - table of Maximal Punching Forces on back + sibling for punching & cutting performance |
![]() ![]() |
Peddinghaus Stanz- und Schnittleistungen | Pocket Steel punching & cutting performance | Specially commissioned by German specialist steel plate supplier Peddighaus (still operating) - table of Maximal Punching Forces on back + sibling for punching & cutting forces |
![]() ![]() |
SKF F&S | Ball Bearings | Specially commissioned by Swedish ball-bearing maker SKF & German shock absorber maker F&S (Fichtel & Sachs) with cm scale in well of stock & 2 cursor windows in back + see also 12½ cm SKF F&S pocket Enhanced Mannheim sibling |
![]() ![]() |
SKF F&S | Pocket Mannheim | Specially commissioned version of 63/39 for Swedish ball-bearing maker SKF & German shock absorber maker F&S (Fichtel & Sachs) + see also 25cm SKF F&S sibling with unique scales for ball bearings |
![]() ![]() |
SPEED | Pocket Mannheim | Unusually for F-C an unbranded version of 63/39 specially commissioned for the unknown company “SPEED” (stylised logo in well of stock) & “Import” stamped in back |
![]() ![]() |
TR1 (ver. 2) | Hybrid electronic calculator | Serial No. 015050144 - red LED display - scale layout chosen to complement basic calculator functions (X2 & 1/X) |
![]() ![]() |
TR2 | Hybrid electronic calculator | Serial No. 027090384 - green LED display - scale layout chosen to complement extended calculator functions (X2, √X, % & 1/X) |
![]() ![]() |
TR3 | Hybrid electronic calculator | Serial No. 034110034 - red LED display - scale layout chosen to complement scientific calculator functions (incl. including log & trig functions) |
![]() ![]() |
TR4 | Electronic calculator | Serial No. 046110135 - green LED display with extended calculator functions but no slide rule |
![]() ![]() |
Verlag Chemie | Chemical | Specially commissioned by German specialist publisher Verlag Chemie - unconventional layout of scales on front with specialist scales + gauge marks for many elements & compounds on back. |
![]() ![]() |
Versuchs- und Lehranstalt für Brauerei | Beer Brewing - System Windisch | Specially commissioned by German institute supporting the beer brewing industry Glasbläserei der Versuchs- und Lehran-stalt für Brauerei - also issued as model 51/80 |
![]() ![]() |
Abbot Brown & Sons / Smiths (Calculators) | |||
Model | Type | Comments | Thumbnail |
Blackwell Average Speed Calculator Mk I | Time-Speed-Distance rallying calculator | Design patented (GB707740) by Harold Blackwell - surprisingly stamped on back “obtainable from Blackwell’s Metallurgical Works Ltd” (was Harold part of a family business?) - later larger duplex Mk II version made | ![]() ![]() |
Lee | Sheet Steel Weight Calculator | For calculating the weight of one or more sheets of steel according to size/thickness of the sheets - made for H.F. Spencer Ltd. - carries the later name of “Smiths (Calculators) Ltd” after Bill Smith sold out to John James |
![]() ![]() |
Resistance Chart for Viscous Flow Only | Pipe flow | Unmarked/unbranded but style & finish very Abbot Brown like - probably a Stohert & Pitt Ltd advertising giveaway - company folded in 1989 & name sold to Langley Holdings | ![]() ![]() |
Thermocontrol | Heat Transmission Calculator | Unmarked/unbranded but style & finish very Abbot Brown like - specially commissioned by Thermocontrol Inst. Co. Ltd | ![]() ![]() |
Addiator GmbH | |||
Model | Type | Comments | Thumbnail |
ADDFEET Junior | Pocket Imperial Slide Adder - gold/green | For non-decimal adding/subtracting in feet, inches & 8ths of inch - baby brother version of larger SIZEMATIC model |
![]() ![]() |
ARITHMA | Pocket Slide Adder - silver | For adding/subtracting but cheaper/simpler version of UNIVERSAL model |
![]() ![]() |
CALCULEX | Multiplication Table | Simple but patented (DE1839275) device mainly for obtaining percentages of values - not to be confused with earlier 1923 slide adder or pocket-watch slide rule types of the same name |
![]() ![]() |
CREDIT-DEBET | Slide Adder (saldo neg.) | Serial no. M 922692 for book-keeping adding/subtracting but with additional display line for negative balances (saldo neg.) on DEBET side |
![]() ![]() |
DUPLEX | Slide Adder - silver | Extended/bigger version of the ARITHMA model - many DUPLEX versions sold |
![]() ![]() |
HEXADAT | Hexadecimal Slide Adder for Computer Programmers | Serial no. 670306 patented (DE1963993) design for adding/subtracting in base 16 - table of hex/dec equivalents on back - possibly most impressive & complex slide adder ever made - read more ... |
![]() ![]() |
MAXIMATOR NEGATIV + SPIECHERWERK | Slide Adder set (2) - gold/green | Serial no. 214840 front hinged adder for adding/subtracting but with additional display line for negative balances (saldo neg.) on subtraction side - smaller adder underneath for storing interim or working results (mechanical memory function) |
![]() ![]() |
PRO CALCULO! | Slide Adder | Primarily a basic adder just for addition but as shown in the instructions via a workaround subtraction is possible |
![]() ![]() |
SIZEMATIC | Imperial Slide Adder - gold/brown | Serial no. 695205 - for non-decimal adding/subtracting in feet, inches & 16ths of inch - big brother version of ADDFEET Junior model |
![]() ![]() |
UNIVERSAL | Pocket Slide Adder (saldo neg.) - gold | For adding/subtracting but with additional display line for negative balances (saldo neg.) |
![]() ![]() |
Addimult Rechenmaschinenfabrik | |||
Model | Type | Comments | Thumbnail |
PROCENTOR | Pocket Basic Retail | Also sold as notepad wallet set with a SUMAT 6 slide adder |
![]() ![]() |
SUPRA | Slide Adder | Made in Sweden for adding/subtracting but because of Addiator metal sheath/case possibly a transition model as son Hans-Wolfgang Kübler set up his own business after working for his father Carl at Addiator |
![]() ![]() |
Addo (AB) | |||
Model | Type | Comments | Thumbnail |
2 | Rack & Pinion Slide Adder - early | Serial No.: 2461 (company later bought by Facit) for addition only - any subtraction done with complementary numbers + fully overhauled & renovated by Huub van Noort in 2009 |
![]() ![]() |
Adix Company | |||
Model | Type | Comments | Thumbnail |
Adix 1 | Column Adder | First generation model (later models had a zero reset lever & brass components) designed by German clockmakers Pallweber & Bordt for for simple addition. |
![]() ![]() |
Aero Products Research Inc. | |||
Model | Type | Comments | Thumbnail |
ERJAVEC | Music Composition | Slide chart copyrighted Music Theory Wheel design by Donald L. Erjavec |
![]() ![]() |
AHREND (Wed. J. Ahrend & Zoon) | |||
Model | Type | Comments | Thumbnail |
(P281) | Demonstration Rietz | made by unknown 3rd party for Hemmi models P280/P281 - Rietz layout but all scales on front face |
![]() ![]() |
435061 (845 Commerz I) | Pocket Business | OEM by ARISTO + Aristo Commerz I in well & Ahrend co-branding with model no. in back |
![]() ![]() |
435064 (89) | Pocket Rietz | OEM by ARISTO + reversed inch scale, cursor window with 1 hairline, Ahrend branding & closed Dutch industrial motor manufacturer De Industrie in back |
|
435660 (P280) | Darmstadt-like two-tone | OEM by HEMMI |
![]() ![]() |
435661 (P281) | Rietz-like two-tone | OEM by HEMMI |
![]() ![]() |
435662 (P283) | Technical two-tone | OEM by HEMMI |
![]() ![]() |
642T | Rietz | OEM by HEMMI as wider version of 64T Extended Rietz + T model no. suffix possibly = basic 64 with extra Trig scales + table of constants & green pads on back + earlier thinner 64T sibling - also sold as Ahrend 643T |
![]() ![]() |
690 (89 RIETZ ) | Pocket Rietz | OEM by ARISTO + reversed inch scale, cursor window with 1 hairline & Ahrend branding in back |
|
691 (99 Rietz) | Rietz | OEM by ARISTO with Aristo-Rietz & D&P in well + inch scale & Ahrend co-branding with model no. in back |
![]() ![]() |
694 (0968 Studio) | Technical/Log-Log | OEM by ARISTO with Aristo Studio & Ahrend No. 694 co-branding on front |
![]() ![]() |
699 (0905 Commerz) | Business - early | OEM by ARISTO with Aristo-Commerz on front + Ahrend co-branding with model no. in back |
|
703 (0970 MultiLog) | Technical/Log-Log | OEM by ARISTO with Aristo MultiLog + Ahrend 703 co-branding on front |
![]() ![]() |
74 | Pocket Rietz - late | OEM by HEMMI with improved layout because of extra peripheral hairlines on cursor + metal backing plate + Dutch retailer Ahrend printed on back |
|
791/7 | Diagonal Scale | Used with a set of dividers for scale ratios 1:1000, 1:5000,1:1250 & 1:2500 |
![]() ![]() |
810 | Diagonal Scale | Used with a set of dividers for scale ratios 1:1000, 1:5000,1:1250 & 1:2500 |
|
ELECTRO 15 | Electro | OEM version made by KHH (5 slits in well + 5 adjustment screws on bottom side edge) but often mistaken as D&P because of model no. - V & W scales in well of stock + conversion tables (in NL) & 2 cursor windows in back - see also identical model sold by, Johann Faber, OHICO & Kahn Frères |
![]() ![]() |
ELECTRO 654 | Electro | OEM by KHH (5 slits in well + 5 adjustment screws on bottom side edge) & identical to Electro 15 model but possibly renumbered to avoid confusion with D&P model no. - V & W scales in well of stock + conversion tables (in NL) & 2 cursor windows in back |
![]() ![]() |
HOLLANDIA-REKENSTOK | Enhanced Mannheim | Hollandia-Rekenstok = Dutch calculating stick - OEM version by Dennert & Pape & 1st slide rule in Ahrend catalogue - cm scale in well of stock + conversion tables (in NL) on back |
![]() ![]() |
NORMAL 650 (Ver. 1) | Enhanced Mannheim | OEM by KHH (5 slits in well + 5 adjustment screws on bottom side edge) + conversion tables (in NL) & 2 cursor windows in back |
|
NORMAL 650 (Ver. 2) | Enhanced Mannheim | OEM by KHH (1 slit in well + 5 adjustment screws on bottom side edge) + conversion tables (in NL) & 2 cursor windows in back |
|
RIETZ 652 | Rietz | OEM by KHH (1 slit in well + 5 adjustment screws on bottom side edge) + conversion tables (in NL) & 2 cursor windows in back |
![]() ![]() |
Albert Martz | |||
Model | Type | Comments | Thumbnail |
System Frank | Pocket long-scale - model 2 | Is wide-bodied & based on original Swiss patent (CH26145) by Wilhelm Frank - table of constants on back |
![]() ![]() |
ALKU (Alfred Kuhmann) | |||
Model | Type | Comments | Thumbnail |
(NoName) | Chemical/Concrete poly-slide (3) | Extra wide body + 3 pairs of non-standard scales (MN, FE, P) are for chemical elements & other 3 pairs are for oxides (CAO, Al2O3, SIO2) - read more ... or try out here an online simulation created by Andries de Man |
![]() ![]() |
(NoName) | Pocket Mannheim | Apparently patented innovative design (no evidence found) using glass because of post-WWII shortages in DDR + three Quality Control stamps on back of slide - read more (in German) … |
![]() ![]() |
ALRO (All-Round) | |||
Model | Type | Comments | Thumbnail |
KWARTETSCHUIF (AC-5.04) | Printing - yellow | Slide chart with © design for a consortium of 4 Dutch regional newspapers so customers could calculate advertising costs for a chosen layout/size (once-off or repeated) in Dutch Gulden - cm & Cicero scales on back + possible prototype as lacking the cut-outs to top edge for slide adjustment found on sibling version in white |
![]() ![]() |
PIRET (AC-1.25) | Machining - Syst. Piret | Specially commissioned by UK-based A.C. Wickman Ltd. + designed by Nestor Piret for wire drawing while working for defunct Dutch company Van Thiel's Draadindustrie + paper table in lid for Wichman Wimet Die sizes 4/10 to 36 showing equivalent sizes in circular Mils & mm according to 6 wire gauge standards - try out an online simulation created by Andries de Man |
![]() ![]() |
VICON 17880570 (AC-2.05b) | Agriculture | Slide chart/slide rule by Dutch supplier of farming machinery VICON (VIssers Construction Nieuw-Vennep) for calculating fertilizer distribution + see also sibling version |
![]() ![]() |
10 R (AC-1.45a) | Waistcoat Rietz two-tone | Listed 1st in catalogue from 1950 |
![]() ![]() |
100 R (AC-1.04a) | Rietz - H | With primary C/D scales nearest to outer rim this layout offered great precision (scale length 28cm) over more popular 200 R with Trig scales next to outer rim + H alongside central nameplate probably = country code for Holland |
![]() ![]() |
100 R (AC-1.04b) | Rietz - early | With primary C/D scales nearest to outer rim this layout offered great precision (scale length 28cm) over more popular 200 R with Trig scales next to outer rim |
![]() ![]() |
1010 Commercial (AC-1.17) | Business long-scale | Double cursor version of innovative but impractical single long-scale 6-spiral patented (CH265561) design + tables of conversion factors in lid - try out an online simulation created by Andries de Man |
![]() ![]() |
1010 Commercial (AC-1.18) | Business long-scale | Single cursor version of Innovative but impractical single long-scale 6-spiral patented (CH265561) design + tables of conversion factors in lid - try out an online simulation created by Andries de Man |
![]() ![]() |
200 R (AC-1.05a) | Rietz | Table of conversion factors in lid + Dutch retailer Bladergroen was an stationer from 1903 to 1980 when it was bought out & name changed to Berlage - try out an online simulation created by Andries de Man |
![]() ![]() |
200 R (AC-1.05a) | Rietz - green finish | One of four metal box finishes (2 x metal & 2 painted) occasionally used |
![]() ![]() |
200 R (AC-1.05a) | Rietz - H early | Code H alongside central nameplate probably = country code for Holland + table of conversion factors in lid |
![]() ![]() |
200 R (AC-1.05a) | Rietz - two-tone paper discs | The use of two-tone paper discs is probably for better contrast/legibility - table of conversion factors in lid |
![]() ![]() |
200 R (AC-1.05b) | Rietz - chrome finish | One of four metal box finishes (2 x metal & 2 painted) occasionally used |
![]() ![]() |
200 R (AC-1.05b) | Rietz - copper finish | One of four metal box finishes (2 x metal & 2 painted) occasionally used |
![]() ![]() |
200 R (AC-1.05b) | Rietz - early | Conversion chart (fractions/decimals) in lid |
![]() ![]() |
200 R (AC-1.05b) | Rietz - green paper discs | Reason for non-standard green/turquoise paper discs & for polished inside box is unknown |
![]() ![]() |
200 R (AC-1.05b) | Rietz - H | Code H alongside central nameplate probably = country code for Holland + conversion chart (fractions/decimals) in lid |
![]() ![]() |
200 R (AC-1.05b) | Rietz - H zinc | Because of a shortage of aluminium during WWII the metal boxes looked identical but for a short time were made of much heavier zinc + code H alongside central nameplate probably = country code for Holland + conversion chart (fractions/decimals) in lid |
![]() ![]() |
200 R (AC-1.05c) | Rietz - no stand | Unconventional 200 R with black heavy-duty metal back plate instead of desk stand - reminiscence of military model with just a back plate |
![]() ![]() |
200 RL (AC-1.49a) | Rietz | RL = Rietz Liniaal (ruler) + failed project to make white plastic linear model + 2 windows with hairline, two expansion slots & table of constants for metals on back - part of prototype batch of +/- 50 |
![]() ![]() |
200 RL (AC-1.49b) | Rietz - monochrome | RL = Rietz Liniaal (ruler) + later (CI scale no longer red) improved version with self-lubricating bearings + 2 windows with hairline, two expansion slots & table of constants for metals on back |
|
300 D (AC-1.08a) | Darmstadt | Version without a P scale + table of conversion factors in lid - subsequently succeeded by 400 D |
![]() ![]() |
300 D (AC-1.08b) | Darmstadt - early | Version with added P scale + table of conversion factors in lid - subsequently succeeded by 400 D |
![]() ![]() |
400 D (AC-1.09) | Darmstadt two-tone | Successor to 300 D with many more gauge marks & CI replacing S&T & P in lid + table of conversion factors in lid - see also larger sibling |
![]() ![]() |
400 D (AC-1.nn) | Desktop Darmstadt two-tone | See also smaller sibling - conversion table of fractions also on back |
![]() ![]() |
50 Ng (AC-1.47) | Waistcoat Basic/Printing two-tone | Ng = Normaal (normal) grafici (printers) + scales on back convert mm into cicero’s/didot points |
![]() ![]() |
50 Nmmi (AC-1.46a) | Waistcoat Basic/Conversion two-tone | Nmmi = Normaal (normal) mm to inches + scales on back convert metric mm into imperial inches |
![]() ![]() |
500 N (AC-1.11) | Basic two-tone | N = Normaal (normal) & is possibly successor to Ha.A2 but with smaller font to make more room for advertising + see also larger sibling |
![]() ![]() |
500 N (AC-1.nn) | Desktop Basic two-tone | N = Normaal (normal) + personally enhanced (lighter plastic outer baseplate & peripheral cursor hairlines) model of last ALRO Technical Director Han Wanders - see also smaller sibling |
![]() ![]() |
500 N Vergouts (AC-1.11) | Basic two-tone | N = Normaal (normal) & is possibly successor to Ha.A2 but with smaller font to make more room for advertising such as Belgium photographers Vergouts + tables of conversion factors from 1010 Commercial in lid |
![]() ![]() |
600 E (AC-1.19) | Electro | E = Electro & successor to ElA - both rare circular examples for this type |
![]() ![]() |
700 H Philips Emission (AC-1.26) | Radio Electronics - early | H = High Frequency with special scales for inductance, capacitance & resonance + CJD monogram for company co-founder Dussel indicates an early model + scales in lid provide the dB figure for various power & voltage ratios - probably inspiration for the much later modern plastic Decibel PTT models |
![]() ![]() |
746 De Muiderkring (AC-1.27) | Radio Electronics two-tone | De Muiderkring = the Dutch publishing arm of Amroh (American Radio House) specialising in radio technology + pictogram colour coding & table of resistances for condensers in lid - see also waistcoat sibling |
![]() ![]() |
746 De Muiderkring (AC-1.nn) | Waistcoat Radio Electronics two-tone | De Muiderkring = the Dutch publishing arm of Amroh (American Radio House) - see also larger sibling |
![]() ![]() |
ABN SZ 14501(AC-5.02) | Finance | Slide chart made for Dutch high street bank ABN (later merged with another bank to become ABN-AMRO) for calculating compound interest monthly payback on a 100 Dutch Gulden loan for rate of 11 to 15.5% (front) & 15.75 to 20% (back) for durations of 12 to 60 months |
![]() ![]() |
AL-RO (AC-1.01) | Basic Retail- prototype | AL-RO model designation (never repeated) is a reference to the full company name + CJD monogram for company co-founder Dussel & earliest pre-production model from original Wildhoeflaan 21 address in The Hague + imperial conversion factors in lid - metal box maybe a replacement |
![]() ![]() |
ALRO (AC-6.04a) | Time/Conversion | Slide Chart version 04a to promote ALRO's trade-marked process ALRODEREN or laminating paper in thin plastic & converting time across 7 times zones for 28 cities around the world |
![]() ![]() |
ALRO (AC-8.09) | Pocket Measuring - transparent | Ruler/protractor to promote/advertise ALRO company |
![]() ![]() |
ALRO (AC-8.nn) | Measuring | Ruler to promote/advertise ALRO company & their PVC products + special version for Amsterdam Efficiency Fair of 1986 |
![]() ![]() |
ALRO (AC-8.nn) | Measuring - German | Ruler to promote/advertise ALRO company & durability of their ALRODEREN process for German market |
![]() ![]() |
ALRO BOVI (AC-6.04a) | Time/Conversion | Slide Chart version 04a made for Dutch sales promotion company BOVI for converting time across 7 times zones for 28 cities around the world |
![]() ![]() |
ALRO-PATENT (AC-1.02) | Basic Retail - prototype | Model designation clearly pre-empting soon to be granted international patents + early pre-production & synonymous with Ha (= Handel -= Retail) + imperial conversion factors - try out an online simulation created by Andries de Man in lid |
![]() ![]() |
ALRODEREN (AC-8.01) | Measuring - transparent | Ruler made to promote ALRO's trade-marked process ALRODEREN or laminating paper in thin plastic + image of office facade in The Hague + horse-head company logo |
![]() ![]() |
ALRODEREN (AC-8.01) | Measuring - white | Ruler made to promote ALRO's trade-marked process ALRODEREN or laminating paper in thin plastic + coloured image of office facade in The Hague + horse-head company logo |
![]() ![]() |
ALRODEREN (AC-8.08) | Colour Sampler | Ruler come sampler for to promote ALRO's trade-marked process ALRODEREN or laminating paper in thin plastic for their head office and only German subsidiary |
![]() ![]() |
ALROPRINT (AC-8.nn) | Colour Sampler | Sampler to promote/advertise ALRO company & quality of their ALROPRINT (synonymous TM with ALROCARD) finish |
![]() ![]() |
AMI-RO-METER (AC-4.01) | Cardiology | Slide chart made for Dutch research-driven global pharmaceutical company Boehringer Ingelheim for calculating probability of myocardial infarction (heart attack) in patients with history of heart problems + AMI-RO = Acute Myocardial Infarction Rotterdam |
![]() ![]() |
ASTRA (AC-4.14) | Medical | Slide chart made for Swedish pharmaceutical company Astra that merged with British Zeneca Group in 1999 to form AstraZeneca for finding the anaesthetic pain control dosage for 31 different types of surgical operation |
![]() ![]() |
Azimuth (AC-1.31) | Astro Navigation - System van der Zalm | Calculates the angular measurement in a spherical coordinate system or more the horizontal angle from a cardinal direction |
|
B.I.P.M. DRILLING (AC-2.01) | Petroleum | Slide chart for calculating optimum drilling of wells according to factors such as penetration rate, drill speed, hydraulic pressure drop, etc + B.I.P.M. = Bataafse Internationale Petroleum Maatschappij or forerunner of company now known as Shell |
![]() ![]() |
B.I.P.M. MUD WEIGHT (AC-2.02) | Petroleum | Slide chart for calculating needed & allowable maximum mud weight for a drilled & flowing well according to factors such as depth, pressure within drill pipe, annular surface pressure, etc + B.I.P.M. = Bataafse Internationale Petroleum Maatschappij or forerunner of company now known as Shell |
![]() ![]() |
BBL TRADELINK (AC-6.04e) | Pocket Time/Conversion | Slide chart version 04e made for Belgium Bank Brussel Lambert (BBL) (Tradelink was the name of their network but bank later acquired by Dutch ING bank) for converting time across 7 times zones for 28 cities around the world |
![]() ![]() |
BIONORM (AC-4.13) | Dietary/Conversion | Slide chart made for 100% plant-based organic branded bioNorm proteins to convert Joules to Calories |
![]() ![]() |
BoB3 (AC-1.nn) | Reinforced Concrete - System Dussel | Personally designed by company co-founder C.J. Dussel + BoB3 = possibly Beton (concrete) & part of alternative model numbering system + forerunner to later Beton version but with additional 70 kg/cm2 scale & extensions for extra strong cement + scales in lid are for calculating no. & size of reinforcement bars |
![]() ![]() |
BOEHRINGER INGELHEIM (AC-4.17a) | Pocket Cardiology | Ruler made for German pharmaceutical company Boehringer Ingelheim & designed by F.A.M. Harms for analysing ECG printouts of cardiac Sinus Rhythms - read more …. |
![]() ![]() |
BOLS (AC-4.19) | Mixology | Slide chart made for Dutch distillery Lucas Bols for mixing 30 different cocktails + tips for mixing drinks on back of slide |
![]() ![]() |
BROEISCHIJF (AC-2.09) | Horticulture | Slide chart designed by Dutchman Wim Granneman in 1975 to calculate how to alter/change flowering/harvesting time of tulip bulbs + can also be used for other perennials & other countries with different seasons + issued by Dutch International Flower Bulb Centre |
![]() ![]() |
CARBORUNDUM (AC-2.11) | Wallet Machining | Slide chart for defunct Dutch subsidiary tool merchant of The Carborundum Company in the form of a wallet for determining machine settings - i.e. speed (rpm) for given diameters of types & coatings of grinding discs + speed table |
![]() ![]() |
CFM (AC-8.11) | Printing | Slide chart made for defunct Dutch factory making printing forms of illustrations Clichéfabriek Maastricht for calculating % reduction/increase when for typesetting/engraving |
![]() ![]() |
Chem (AC-1.23) | Chemical two-tone | Chemical credence comes from over 140 chemical-related gauge marks + table of all atomic weights from 1948 in lid - see also online simulation by Andries de Man |
![]() ![]() |
CINCINNATI MILACRON (AC-2.17a) | Machining - ver. 1 | Slide chart for defunct Dutch subsidiary of USA machine tool builder Cincinnati Milacron with copyrighted design (1 moving ring) for calculating grinding parameters + see also advanced sibling |
![]() ![]() |
CINCINNATI MILACRON (AC-2.17b) | Machining - ver. 2 | Slide chart for defunct Dutch subsidiary of USA machine tool builder Cincinnati Milacron with copyrighted design (2 independently moving rings) for calculating grinding parameters + see also basic sibling |
![]() ![]() |
COLORSTAR (AC-8.03) | Photography | Slide chart/nomogram (n.b. not a slide rule) made for Dutch supplier of photographic darkroom products LiCi Colorstar for calibrating their early range of colour analysers in combination with a test print |
![]() ![]() |
CORDARONE (AC-4.06) | Pocket Cardiology | Ruler (unusually fitted with a cursor) made for American pharmaceutical company Wyeth-Ayerst Laboratories (acquired by Pfzier in 2009) & registered brand name owner of Cordarone (drug for irregular heart beats) for analysing ECG printouts of cardiac Sinus Rhythms - read more …. |
![]() ![]() |
CORDARONE (AC-4.06) | Pocket Cardiology - prototype | Ruler (unusually with a cursor) probably prototype for American pharmaceutical company Wyeth-Ayerst Laboratories (acquired by Pfzier in 2009) & brand name owner of Cordarone (drug for irregular heart beats) for analysing ECG printouts of cardiac Sinus Rhythms + unlike sibling has plain back |
![]() ![]() |
DAST (AC-6.01) | Lilliput Calendar | Slide chart DAST = DAtum (date) STandaard (standard) is a perpetual calendar for the years 1300 to 2499 |
![]() ![]() |
DATA CARD (AC-6.04c) | Time/Conversion | Slide Chart version 04c made for defunct Euro-American card manufacturer Data Card (they later bought ALRO & in turn was acquired by conglomerate Entrust) for converting time across 7 times zones for 28 cities around the world |
![]() ![]() |
DATA CARD (AC-6.04d) | Time/Conversion | Slide Chart version 04d made for defunct Euro-American card manufacturer Data Card (they later bought ALRO & in turn was acquired by conglomerate Entrust) for converting time across 7 times zones for 28 cities around the world |
![]() ![]() |
DE BUCK & PAULICH (AC-8.10) | Printing | Slide chart made for defunct Belgium photo engravers De Buck & Paulich for calculating % reduction/increase when for typesetting/engraving |
![]() ![]() |
DE ECHTE BAKKER (AC-6.04a) | Time/Conversion | Slide Chart version 04a made for Dutch guild of artisan bakers De Echte Bakker for converting time across 7 times zones for 28 cities around the world |
![]() ![]() |
DE KINKELDER (AC-6.03) | Pocket Building | Slide chart made for Dutch construction company Gebr. de Kinkelder B.V. for calculating spread of workable days/month throughout the year - front for maximum of 200 working days/year & back for maximum of 191 (allowing for lost days due to high winds) working days/year |
![]() ![]() |
DELTA LLOYD (AC-2.25) | Pocket Building Measuring | Slide chart/ruler made for Dutch insurance company Delta Lloyd with unusual mirrored (anamorphosis) scale to measure thickness of framed glass by placing the bevelled top edge against the glass surface & reading off the thickness from the reflection |
![]() ![]() |
DEMABO (AC-8.nn) | Pocket Measuring | An architects ruler made for defunct Dutch construction company Demabao Systeembouw |
![]() ![]() |
DIKEMA EN CHABOT (AC-2.14) | Steel Bars | Slide chart made for defunct Dutch steel wholesaler Dikema en Chabot for calculating size & weight for a given length of steel bar with either a H or U profile |
![]() ![]() |
DISCABOIS (AC-1.24) | Forestry - System Brouhon | Patented design (BE492292) by J.L. Brouhon from 1949 for wood merchants, wood sawmills, etc + tables of conversion factors from 1010 Commercial in lid + price included surcharge over other Ø 13cm models - see also online simulation by Andries de Man |
![]() ![]() |
DOSSCHE (AC-2.08) | Pocket Agriculture | Slide chart for defunct Belgium cattle-feed supplier (factories in Deinze & Zolder) Dossche for calculating the estimated respective gestation time for pigs, sheep, cattle & horses |
![]() ![]() |
ElA (AC-1.nn) | Electro | ElA = Electrotechniek (electrical engineering) forerunner to later 600 E & part of alternative model numbering system - both rare circular examples for this type |
![]() ![]() |
ELASCON (AC-8.02) | Building | Template made for defunct Dutch construction company Electra LAS COmbinatie Nederland (Elascon) for drawing profiles of metal roofing or cladding panels |
![]() ![]() |
EMF DORDT (AC-3.10) | Electro | Slide chart for calculating power, efficiency & wiring of electric motors + EMF DORDT = nickname of defunct Dutch company Willem Smit & Co.‘s Electromotorenfabriek that produced large commercial electrical motors |
![]() ![]() |
ETBI (AC-5.03) | Paper | Slide chart made for defunct Dutch wallpaper company Eerste Twentse Behang Industrie (ETBI) for calculating total price in Dutch Gulden for buying 7 to 12 rolls of wallpaper in price range of fl 1.20 to 5.85/roll |
![]() ![]() |
FINNCELL (AC-2.12) | Timber | Slide chart for defunct Finish company Finncell showing location, capacity & types of product produced at each of their 29 wood pulp/cellulose mills in Finland |
![]() ![]() |
Geluidsniveauverschil van gevels (AC-7.03) | Building Facades | Slide rule/slide chart for calculating sound levels in dB for building facades - © 1983 design by ministerie V en M = now defunct Dutch Ministerie van Volksgezondheid en Milieuhygiëne (Ministry of Health and Environmental Hygiene) |
![]() ![]() |
GEVAERT (AC-8.07) | Photography | Slide chart made for Belgium manufacturer of photographic paper L. Gevaert & Cie (later became Belgium-German multinational company Agfa-Gevaert) for calculating how to optimally reproduce photographic images mechanically using an inked plate created from a photographic negative |
![]() ![]() |
GIST-BROCADES HWV (AC-2.18) | Cooking | Slide chart made for defunct Dutch chemical & pharmaceutical company Gist-Brocades N.V. for calculating % of water to flour needed for 30 small or large pieces of dough for 13 different types of bread |
![]() ![]() |
GRASSO-PERSLUCHT (AC-2.22) | Refrigerant/Conversion | For air pressure & flow calculations + GRASSO-PERSLUCHT = Dutch company for industrial refrigeration equipment + table of constants/conversion factors & ALROPRINT on back |
![]() ![]() |
GRAVURA (AC-1.47) | Waistcoat Basic/Printing two-tone | Specially commissioned 50 Ng for Gravura N.V. a printer & illustrator based in Dutch town of The Hague |
|
GTI INSTALLATIETECHNIEK (AC-2.10) | Central Heating | Slide chart for converting heat transfer values in central heating systems + gti installatietechniek = Dutch plumbing company + ALROPRINT & © TRD/1977/10 |
![]() ![]() |
Ha Tex (AC-1.15) | Business/Textile - early | Ha Tex = Handel (business) Textiel (textiles) for textile-based calculations with UK pre-decimal £sd currency & yards |
![]() ![]() |
Ha Tex (AC-1.16b) | Business/Textile | Ha Tex = Handel (business) Textiel (textiles) for textile based calculations with UK pre-decimal £sd currency & yards + tables of conversion factors from 1010 Commercial in lid - see also online simulation by Andries de Man |
|
HA-ES Perfecta-Kiezer (AC-2.26) | Heating Pumps | Slide chart look-up table on back to help select most suitable heating pump for commercial use (e.g. greenhouses) from HA-ES “perfecta” range made by defunct Dutch company Meppeler Machinefabriek |
![]() ![]() |
Ha.A2 (AC-1.12) | Basic Retail | Ha.A2 possibly part of alternative model numbering system & predecessor to 500 N AC-1.11 but with larger font & 4 pre-decimal & imperial conversion scales in lid + prefix Ha = possibly Handel (retail) |
![]() ![]() |
HAVAM (AC-2.20) | Motoring/Conversion | Slide chart for defunct Dutch car parts retailer HAVAM for torque settings + pressure & usage conversion tables |
![]() ![]() |
HAVAM (AC-2.21) | Conversion | Slide chart for defunct Dutch car parts retailer HAVAM for converting UK/USA imperial values to metric |
![]() ![]() |
HEWLETT PACKARD (AC-4.17b) | Pocket Cardiology | Ruler made for American multinational IT company Hewlett Packard (HP) & designed by F.A.M. Harms for analysing ECG printouts of cardiac Sinus Rhythms - read more …. |
![]() ![]() |
HOECHST (AC-4.08) | Dermatology | Slide chart made for German chemicals/life-sciences company Hoechst AG (later became Sanofi Aventis) using a pair of dividers to measure size of elliptic skin sores (Laesiomat is Latin for hurting) & calculate area in mm2 + adverts for branded skin salves on back |
![]() ![]() |
HOECHST (AC-4.10) | Cardiology - transparent | Ruler Cor-V-Mat® incorporating nomograms made for German chemicals/life-sciences company Hoechst AG (later became Sanofi Aventis) & designed by Prof. Keuskamp for analysing ECG printouts of cardiac Sinus Rhythms - read more …. |
![]() ![]() |
HOEK LOOS (AC-4.07) | Paediatrics | Slide chart made for defunct Dutch producer of oxygen & other gases Hoek Look for Amsterdam Infant Ventilator Machine designed by Prof. Keuskamp for calculating respiration flow rates & air/oxygen flow rates |
![]() ![]() |
IBM 00685 (AC-8.06a) | Typometer Composer | Ruler made for American International Business Machines (IBM) for working in Cicero, Pica & IBM typographic units with typewriters |
![]() ![]() |
IBM 00687 (AC-8.06b) | Typometer Composer | Ruler made for American International Business Machines (IBM) for working in Points, Cicero, Pica & IBM typographic units in desk-top publishing |
![]() ![]() |
KLIMAATKONTRAKT (AC-2.19) | Desktop Energy Saving | Slide chart made for & © designed by KK/TRD consisting of consisting of 4 rings of energy saving tips ranked by low/medium/high investment levels for: (i) heating systems (front) or (ii) lighting, energy & sanitation (back) |
![]() ![]() |
Klinische Rekencirkel (AC-1.39) | Desktop Medical - System Lips | Highly complex specialised layout of scales designed by Dr. A. Lips + facilitates 26 medical based calculations (metabolic-related on front & blood ph/gasses on back) - read more … or try out Andries de Man's two online simulations: (i) front & (ii) back |
![]() ![]() |
KLM (AC-6.04c) | Time/Conversion | Slide Chart version 04c made for Dutch airline KLM for converting time across 7 times zones for 28 cities around the world |
![]() ![]() |
KLM AIR FREIGHT (AC-2.16) | Aviation | Slide Chart made for Dutch airline KLM for calculating dimensional or volumetric weight (imperial or metric) based on a package's length, width & height using benchmark of either 7 cubic decimetres = 1 kg or 194 cubic inches = 1 Lb |
![]() ![]() |
KLM CONVAIR 240 (AC-1.nn) | Aviation | Load adjuster (possibly pre-production) made for Dutch airline KLM who had 1st fleet in Europe of American-made Convair 240 passenger planes - see also earlier prototype sibling |
![]() ![]() |
KLM CONVAIR 240 (AC-1.nn) | Aviation - prototype | Load adjuster prototype made for Dutch airline KLM who had 1st fleet in Europe of American-made Convair 240 passenger planes + table of conversion factors in lid - see also later (possibly pre-production) sibling |
![]() ![]() |
KLM FLYING DUTCHMAN (AC-6.nn) | Time/Conversion | Slide chart made for frequent flyer/loyalty programme of Dutch airline KLM for converting time across 7 times zones for 117 KLM destinations around the world |
![]() ![]() |
KLM Petrol & Oil Tables (AC-1.29) | Petroleum/Conversion | Slide chart made for Dutch airline KLM (old style logo) for converting imperial & US gallons to lbs, kg, etc for range & loading calculations - see also all-metal early version & prototype |
![]() ![]() |
KLM Petrol & Oil Tables (AC-1.29) | Petroleum/Conversion - early | All-metal silver coloured slide chart made for Dutch airline KLM (old style logo) converting imperial & US gallons to lbs, kg, etc for range & loading calculations - see final production model |
![]() ![]() |
KLM Petrol & Oil Tables (AC-1.29) | Petroleum/Conversion - prototype | Prototype slide chart made for Dutch airline KLM (old style logo) converting imperial & US gallons to lbs, kg, etc for range & loading calculations + strange reference to Portugal's Lisbon Portela airport- see final production model |
![]() ![]() |
KLM SYST ALRO - System van Roon (AC-1.35) | Desktop Aviation | Desktop version of smaller GoA with high-precision goniometric layout (double length Trig scales) by van Roon + specially commissioned flight computer for Dutch airline KLM for calculating course & wind correction |
![]() ![]() |
KLM Take-off & Cruise Power (AC-2.15) | Aviation | Slide Chart for Dutch airline KLM for calculating the BMEP (Brake Mean Effective Pressure) for 3 series' of engine |
![]() ![]() |
KLOOS (AC-1.30) | Steel Constructions | Slide chart for calculating steel forms needed to construct: (i) fixed & opening bridges & (ii) points & crossing for railways & tramways + KLOOS = F. Kloos en Zonen’s originally a Dutch ship builder that evolved into making all manner of heavy-duty steel constructions |
![]() ![]() |
KNM BEGEMANN (AC-2.27) | Pipe Flow | Slide chart for calculating resistance in pipes (front) & pump capacity needed (back) + KNM Begemann = defunct Dutch company Koninklijke Nederlandsche Machinefabriek v/h E.H. Begemann manufacturing pumps & steel constructions + table of resistance values on back |
![]() ![]() |
KWARTETSCHUIF (AC-5.04) | Printing - white | Slide chart with © design for a consortium of 4 Dutch regional newspapers so customers could calculate advertising costs of a chosen layout/size (once-off or repeated) in Dutch Gulden + cm & Cicero scales on back |
![]() ![]() |
LiCi Transistor CdS (AC-1.41) | Pocket Photography | Unusual battery-driven light exposure meter (with built-in micro measuring cell) made for for Dutch supplier of photographic darkroom products LiCi Colorstar according to a copyrighted design by Phlip van Meeuwen (GFK) |
![]() ![]() |
LILLY (AC-4.18) | Dietary | Slide chart eating guide made for Dutch subsidiary of American pharmaceutical company Eli Lilly & jointly issued with the Dutch Diabetes Society for finding kcal, Kh(g) & MK (= meal code) values for many types of food & drink |
![]() ![]() |
MILITAIRE REKENSCHIJF (AC-1.32) | Military Terrain Analysis two-tone | Made for Dutch Army with scales calibrated in NATO Milliradian (Mils) for angular measurement + pouch with belt clip shows it was intended for use in field of action |
![]() ![]() |
MILITAIRE REKENSCHIJF (AC-1.33) | Military Terrain Analysis two-tone | Made for Dutch Army with scales calibrated in NATO Milliradian (Mils) for angular measurement but being metal cased version was for army barracks or classroom/study |
![]() ![]() |
MILITARY CALCULATOR (AC-1.nn) | Military Terrain Analysis two-tone | Made foreign armies with scales calibrated in NATO Milliradian (Mils) for angular measurement but being metal cased version was for army barracks or classroom/study |
![]() ![]() |
MOEDERS VOOR MOEDERS (AC-4.11a) | Pocket Obstetrics - lime green | Slide chart made for founding company Organaon for pregnant mother’s in early stages of pregnancy for planning when to donate urine to help other couples with fertility problems + Moeders voor Moeders = Dutch pharmaceutical organisation that extracts hCG hormone from the urine to create fertility medicines + see also larger version |
![]() ![]() |
MOEDERS VOOR MOEDERS 01/10/038 (AC-4.11b) | Obstetrics | Slide chart for pregnant mother’s in early stages of pregnancy for planning when to donate urine to help other couples with fertility problems + Moeders voor Moeders = Dutch pharmaceutical organisation that extracts hCG hormone from the urine to create fertility medicines + see also pocket versions |
![]() ![]() |
MOEDERS VOOR MOEDERS 038 (AC-4.11a) | Pocket Obstetrics - emerald green | Slide chart for pregnant mother’s in early stages of pregnancy for planning when to donate urine to help other couples with fertility problems + Moeders voor Moeders = Dutch pharmaceutical organiation that extracts hCG hormone from the urine to create fertility medicines + see also larger version |
![]() ![]() |
MOEDERS VOOR MOEDERS 88/05/038 (AC-4.11a) | Pocket Obstetrics - blue | Slide chart for pregnant mother’s in early stages of pregnancy for planning when to donate urine to help other couples with fertility problems + Moeders voor Moeders = Dutch pharmaceutical organisation that extracts hCG hormone from the urine to create fertility medicines + see also larger version |
![]() ![]() |
MSD CO-RENITEC (AC-6.04d) | Time/Conversion | Slide Chart version 04d made for American biopharmaceutical company MSD (Co-Renitec is brand name for a high blood pressure treatment) for converting time across 7 times zones for 28 cities around the world |
![]() ![]() |
NATIONALE VERKEERSAKAMEDIE TILBURG (AC-7.05) | Transport - black | Slide rule/slide chart for predicting traffic sound levels according to several parameters such as type of road, type of vehicle, etc according to design by H.J. van Zuylen + Nationale Verkersakademie Tilburg = defunct Dutch technical school in Tilburg for educating traffic specialists |
![]() ![]() |
NATIONALE VERKEERSAKAMEDIE TILBURG (AC-7.05) | Transport - green & black | Slide rule/slide chart for predicting traffic sound levels according to several parameters such as type of road, type of vehicle, etc according to design by H.J. van Zuylen + Nationale Verkersakademie Tilburg = defunct Dutch technical school in Tilburg for educating traffic specialists |
![]() ![]() |
NAUTA & HAAGEN (AC-8.12) | Printing | Slide chart made for defunct Dutch digital printers Nauta & Haagen (later Kampert-Nauta) for calculating % reduction/increase when for typesetting/engraving |
![]() ![]() |
NEC (AC-6.04b) | Time/Conversion | Slide chart version 04b made for Dutch consultancy consortium Nederlandse Export Combinatie (NEC) for converting time across 7 times zones for 28 cities around the world |
![]() ![]() |
Ned. Octr. Aangevr. (AC-1.03) | Rietz two-tone | Ned. Octr. Aangevr. = Dutch patent applied for so possibly an early pre-production model with CJD monogram for company co-founder Dussel + imperial conversion factors in lid - sadly metal box & patent nameplate are replacements |
![]() ![]() |
NIPO (AC-7.09) | Statistics | Slide chart for calculating the significance between two independent statistical samples + NIPO = Nederlands Instituut voor Publieke Opinie (Dutch institute for public opinion) + table of conversion factors for reliability on inner slide |
![]() ![]() |
NoName (AC-6.02) | Time | Slide chart made for unnamed company or organisation (but where form. 5007 03-90 60.06 has some meaning) for calculating duration in hours (maximum two weeks) between two daytime timeslots in a calendar week |
![]() ![]() |
NoName (AC-6.06) | Aviation/Conversion | Unusual slide rule/slide chart/nomograms (2 x Ø 7½cm discs) made for unnamed company or organisation (but Ka6 is a single-seater glider built by Alexander Schleicher GmbH & Co in Germany) for use as simple flight computer & for wind speed conversion + flying check-lists on back |
![]() ![]() |
NoName (AC-8.04) | Military Measuring | Protractor/ruler without any branding but classic 180⁰ scale is paired with NATO military favoured alternative: MILS |
![]() ![]() |
NUTRICIA (AC-4.04) | Pocket Paediatrics | Slide chart made for Dutch founded healthcare company Nutricia that later became part of French conglomerate Danone for calculating, according to a baby's weight, number & size daily doses for 6 baby food/nutrition products |
![]() ![]() |
Oil Spill (AC-7.06) | Petroleum | Slide chart with © design Dept. of Transport & Public Works of The Netherlands for predicting the probable outcome of an oil spill based on spread, drift, mass balance, evaporation, dispersion & emulsification |
![]() ![]() |
ORGANON (AC-4.15) | Obstetrics | Nomogram made for global healthcare company Organon showing contraception efficacy of 2 estragon & 9 other oral contraceptives for differing parts of menstrual cycle |
![]() ![]() |
PHILIPS (AC-7.08) | Military Quality Control | Slide chart made for Dutch electronic multinational Philips for Acceptable Quality Level (AQL) according now defunct American military defence standard MIL-STD-105-D for determining maximum acceptable number of defects for a given batch size of purchased components using either Single or Double samples (different sides) & Normal (N), Tightened (T) or Reduced (R) types of inspections |
![]() ![]() |
PHILIPS AUDIO COMMUNICATIIONS (AC-3.02) | Electronic/Conversion | Slide chart for Dutch electronic multinational Philips for calculating dB decibel ratios & converting them into various current, voltage & power ratios + 1 of 3 versions |
![]() ![]() |
PHILIPS DATA SYSTEMS (AC-3.11) | Desktop Memory Mapping for computer programmers | Slide chart made for Dutch electronic multinational Philips with © design for their P300 bookkeeping minicomputer showing available functions according memory sectors A to S |
![]() ![]() |
PHILIPS ELA 17 8100 70 316221 (AC-3.03) | Electronic/Conversion | Slide chart/nomogram for ELA (Electro-Acoustiek) division of Dutch electronic multinational Philips for calculating dB decibel ratios & converting them into various current, voltage & power ratios + 1 of 3 versions |
![]() ![]() |
PHILIPS ELA 68/43/4112 (AC-3.01) | Electronic/Conversion | Slide chart/nomogram for ELA (Electro-Acoustiek) division of Dutch electronic multinational Philips for calculating dB decibel ratios & converting them into various current, voltage & power ratios + earliest of 3 versions |
![]() ![]() |
PHILIPS MEDICAL SYSTEMS (AC-4.12) | Pocket Obstetrics | Slide chart made for Dutch electronic multinational Philips for calculating foetal size & age from crow-rump length (CRL) or foetus length from top of head to bottom of torso & biparietal scull diameter (BPD) ultrasound results |
![]() ![]() |
PHILIPS MINIWATT Transistors (AC-3.05) | Electronics | Slide chart for Dutch electronic multinational Philips to check specificatiions for OC series of tansistors |
![]() ![]() |
PHILIPS MINIWATT Valve Pins (AC-3.07) | Electronics - blue | Slide Chart (later version) made for Dutch electronic multinational Philips for showing 8-pin layout (a=anode, f=filament, g=grid, h= heated, k=cathode & i.c.= internally connected) of Miniwatt range of valves + see earlier sibling |
![]() ![]() |
PHILIPS MINIWATT Valve Pins (AC-3.07) | Electronics - green | Slide chart (early version) made for Dutch electronic multinational Philips for showing 8-pin layout (a=anode, f=filament, g=grid, h= heated, k=cathode & i.c.= internally connected) of Miniwatt range of valves + see also later sibling |
![]() ![]() |
PHILIPS Resistors (AC-3.08) | Electronics | Nomogram made for Dutch electronic multinational Philips for designing 6 different carbon film resistors with 3 different resistor values |
![]() ![]() |
PHILIPS TELECOMMUNICATION DECIBEL (AC-1.44) | Waistcoat Radio Electronics two-tone | Larger versions made for PTT |
![]() ![]() |
PHILIPS TV Control Unit (AC-3.13) | Electronics | Slide chart made for Dutch electronic multinational Philips for step-by-step set up/troubleshooting schematics & settings of XG 7100/XG 7104 TV control unit |
![]() ![]() |
PLANISFEER (AC-6.05) | Desktop Astronomy - Northern Hemisphere | Slide chart designed as planisphere by Dutchman R. Walrecht to calculate star positions & star signs at latitude 52º North & longitude 5º East for given date & time + just 1000 made but later versions made by PlantijnCasparie |
![]() ![]() |
PLANOSEC (AC-4.09) | Pocket Obstetrics | Slide chart made for Dutch branded pregnancy test Planosec showing the pregnancy cycle in weeks/months from 1st day of last menstruation to expected date of birth |
![]() ![]() |
POPE Valve Pins (AC-3.06) | Electronics | Slide Chart made for Dutch lightbulb maker Pope (later taken over by Dutch electronic multinational Philips) for showing the 8-pin layout (a=anode, f=filament, g=grid, h= heated, k=cathode & i.c.= internally connected) of Philips valves + see later Philips version |
![]() ![]() |
PORTANJE (AC-4.17) | Pocket Cardiology | Ruler made for defunct Dutch medical electronics company Portanje Elektronika & designed by F.A.M. Harms for analysing ECG printouts of cardiac Sinus Rhythms - read more …. |
![]() ![]() |
PRIMAP (AC-6.04c) | Time/Conversion | Slide Chart version 04c made for Dutch paint company Primap Coatings for converting time across 7 times zones for 28 cities around the world |
![]() ![]() |
PTT DECIBEL (AC-1.42) | Radio Electronics | PTT = Posterijen, Telegrafie en Telefonie or old Dutch post, telegraph & phone company & NL NR 04 - 2220 = ordering no. + see smaller sibling |
![]() ![]() |
PTT DECIBEL (AC-1.43) | Pocket Radio Electronics | PTT = Posterijen, Telegrafie en Telefonie or old Dutch post, telegraph & phone company & NL NR 04 = ordering no. + see larger sibling |
![]() ![]() |
PTT RADIOLOGISCHE (AC-7.02a) | Radiation | Slide rule/slide chart for calculating radioactive doses & intensities from a 1978 patented design (US4117315) from C.G.F. Amy & K.K. Keimpema+ issued as 4/8/1075/76346 by PTT = Posterijen, Telegrafie en Telefonie or old Dutch post, telegraph & phone company + see also large demonstration sibling |
![]() ![]() |
PTT RADIOLOGISCHE (AC-7.02b) | Demonstration Radiation | Slide rule/slide chart for calculating radioactive doses & intensities from a 1978 patented design (US4117315) from C.G.F. Amy & K.K. Keimpema+ issued as 4/8/1075/76346 by PTT = Posterijen, Telegrafie en Telefonie or old Dutch post, telegraph & phone company + see also smaller but not small sibling |
![]() ![]() |
QUESTRAN (AC-4.16) | Pocket Biology | Slide chart made for medicine trade name Questran for calculating number of daily doses of cholestyramine to reduce cholesterol - these days drug largely replaced by statins |
![]() ![]() |
RADIOLOGISCHE (AC-7.01) | Pocket Military Radiation | Slide rule/slide chart made for Dutch military personnel (NATO NSN no. 6665-17-055-1115) to calculate the effects & fall out directly after a nuclear explosion |
![]() ![]() |
Resistors & Capacitors (AC-3.04) | Electronics | Slide chart with unusual construction & colour-coding for for choosing resistors & capacitors with appropriate values & tolerances |
![]() ![]() |
Roulette (AC-1.nn) | Gambling | Adapted 200 R with gauge marks as pay-out odds for 6 popular types of bets possible on the numbers part of a French style roulette table - reputedly conceived by Capt. Hans Feierabend read more … |
|
SCHERING (AC-2.07) | Agriculture | Slide chart made for defunct Belgium agrochemical company N.V. Schering S.A. for calculating the the appropriate use of pesticides when growing beetroot |
![]() ![]() |
SHELL MESC 1962 (AC-2.04) | Machining | Slide Chart made for Shell for normal & heavy-duty metal bolts per ASA & BS tables in inches & mm & according the Shell's Group 81 MESC (Material and Equipment Standards and Code) catalogue specification |
![]() ![]() |
SHELL VISCOKLOK (AC-1.40) | Petroleum | Shell © clock (klok) design for calculating in 4 standard units viscosity of various oils at different temperatures - try out an online simulation created by Andries de Man |
![]() ![]() |
SIRKORSKY S-51 (AC-1.nn) | Aviation - prototype | Rare load adjuster for an American helicopter + prototype possibly made for aviation branch of Dutch Navy (Marine Luchtvaartdienst - MLD) who nicknamed it Jezebel |
![]() ![]() |
Spoorweglawaai (AC-7.04) | Transport | Slide rule/slide chart for predicting overall railway trackside noise level in dB(A) according to several parameters e.g. noise screen, type & frequency of trains, average speed, etc - ALROPRINT 922130 |
![]() ![]() |
ST 9-430/2 (AC-1.34a) | Military Artillery Range Finding (1 of 2) | One of a pair of rules, without slides but with erasable cursors faces for hand-drawn pencil hairlines, made for the Dutch Army – the laminated (Alroderen™) paper tables & model # are ex-Army |
![]() ![]() |
ST 9-430/2 (AC-1.34b) | Military Artillery Range Finding (2 of 2) | Two of a pair of rules, without slides but with erasable cursors faces for hand-drawn pencil hairlines, made for the Dutch Army – the laminated (Alroderen™) paper tables & model # are ex-Army |
![]() ![]() |
SYNRES (AC-2.23) | Desktop Paint Viscosity/Conversion | Slide chart converting viscosity values between various standardised units + SYRES = Dutch company (still operating) specialising in commercial coatings & resins for buildings, boats, cars, etc |
![]() ![]() |
T.K.F. (AC-1.45b) | Waistcoat Rietz | Specially commissioned 10 R for T.K.F. = Twentsche Kabelfabriek (Twentsche Cable Factory) was originally a cable manufacturer based in Dutch town Haaksbergen but is now a leading supplier of connectivity solutions |
![]() ![]() |
TEBODIN ANSI B16 (AC-2.13) | Pipe Flanges & Fittings - fawn | Slide chart (in various colours) for designing cast meral pipe flanges & fittings according to ANSI standard B16 + Tebodin is an abbreviation for “Nederlandsch Technisch Bureau voor Ontwikkeling der Industrie” (Dutch Technical Bureau for Development of Industry) founded by Frederik van Iterson in1945 |
![]() ![]() |
TEBODIN ANSI B16 (AC-2.13) | Pipe Flanges & Fittings - grey | Slide chart (in various colours) for designing cast metal pipe flanges & fittings according to ANSI standard B16 + Tebodin is an abbreviation for “Nederlandsch Technisch Bureau voor Ontwikkeling der Industrie” (Dutch Technical Bureau for Development of Industry) founded by Frederik van Iterson in1945 |
![]() ![]() |
TERONAC (AC-4.nn) | Pocket Dietary | Slide chart made for registered brand name Teronac (generic name for slimming drug no longer normally available) to calculate an individuals Body Mass Index (BMI) based just on metric height & weight |
|
TNO-IBBC (AC-7.07) | Pocket Building Measurement - transparent | Ruler made for Dutch Organistie Voor Toegepast Natuurwetenschappelijk Onderzoek (TNO or Organisation for Applied Scientific Research) Instituut voor Bouwmaterialen en Bouwconstructies (IBBC or Institute for Building Materials & Construction) to measure cracks in walls |
![]() ![]() |
Truck Tyre Performance (AC-1.20) | Commercial Transport | CJD monogram of company co-founder Dussel suggest an early model for determining large/heavy goods vehicle (HGV) tyre sizes + 3rd party Table of Truck Tyre Pressures in lid |
![]() ![]() |
Tubes MINIWATT Valve Pins (AC-3.07) | Electronics - prototype | Slide chart possible made as prototype to show 8-pin layout (a=anode, f=filament, g=grid, h= heated, k=cathode & i.c.= internally connected) of Miniwatt range of valves + see later Philips production version |
![]() ![]() |
VALVO-RECHNER Transistors (AC-3.09) | Electronics | Slide chart made for Germany company Valvo (when still part of electronic multinational Philips) for designing different low-frequency transistors |
![]() ![]() |
VAM (AC-5.05) | Finance | Slide chart made for 40th anniversary of Dutch training organisation Stitching VAM (these days called Innovam & for cars) for calculating annual financial yield in Dutch Gulden for shops selling 100 to 700 bicycles/year |
![]() ![]() |
VAN KRANENBURG (AC-1.45b) | Waistcoat Rietz two-tone | Specially commissioned 10 R for Van Kranenburg a now defunct heavy machinery company based in Dutch city of Rotterdam |
![]() ![]() |
VERCOMBI (AC-2.24a) | Machining | Slide chart for looking-up DIN & NEN standard sizes for nuts & bolts according to ISO & Whitworth standards + VERCOMBI refers to a joint purchasing company of the day for Dutch makers of screws & bolts Nedschroef & EWES + see also sibling version |
![]() ![]() |
VICON 81982 (AC-2.05a) | Agriculture | Slide chart with © design by Dutch supplier of farming machinery VICON (VIssers Construction Nieuw-Vennep) for calculating fertilizer distribution + see also sibling version |
![]() ![]() |
VOLMAC (AC-8.05) | Work Flow - blue | Template/ruler (opaque) made for defunct Dutch IT company Volmac (later became part of Capgemini) for documenting with symbols processes & tasks which need to occur in a particular order |
![]() ![]() |
VOLMAC (AC-8.05) | Work Flow - yellow | Template/ruler (opaque) made for defunct Dutch IT company Volmac (later became part of Capgemini) for documenting with symbols processes & tasks which need to occur in a particular order |
![]() ![]() |
VvS (AC-2.24b) | Machining | Slide chart for looking-up DIN & NEN standard sizes for nuts & bolts according to Metric & Whitworth standards + VvS refers to a joint purchasing company of the day for Dutch maker of screws & bolts Verkoopkantoor voor Schroefbouten + see also sibling version |
![]() ![]() |
WeM (AC-1.nn) | Rietz | WeM is part of alternative model numbering system + WeM = possibly Werktuig- en Machinebouw (mechanical engineering/machine industry) + possible forerunner to later (?) 200 R |
![]() ![]() |
WeR2 (AC-1.06) | Rietz - early | WeR = possibly WeRktuigbouw (mechanical engineering) & part of alternative model numbering system + forerunner to later 100 R - later WeR2's included a version no. although only discernible difference on a later sibling was scale annotations in red |
![]() ![]() |
WeR2 5 (AC-1.07) | Rietz | WeR = possibly WeRktuigbouw (mechanical engineering) & part of alternative model numbering system + forerunner to later 100 R - model suffix 5 is possibly version no. although only discernible difference to earlier sibling is scale annotations in red |
![]() ![]() |
ZYMA-NEDERLAND (AC-4.05) | Nephrology | Nomogram made for defunct Dutch company Zyma-Nederland to help doctors by showing expected kidney renal function/performance levels for creatinine clearance & serum creatinine based on a patient's age & weight (n.b. underlying formulas now considered obsolete) |
![]() ![]() |
Aristo | |||
Model | Type | Comments | Thumbnail |
0929 MultiTrig | Technical two-tone | Reissue with amended layout of earlier MultiRietz version |
![]() ![]() |
01068 Studio | Desktop Technical/Log-Log two-tone | Extra wide - see also smaller siblings & pocket sibling |
![]() ![]() |
01070 MultiLog | Desktop Technical/Log-Log | Extra wide + Multilog v/s Studio = extra LL00 & LL0 scales - see also smaller sibling |
![]() ![]() |
0602 | Pocket Basic Retail two-tone | Leading zero in model no. seems out of place + probable promotional give away as I.E.O. Breda printed in gold on case |
![]() ![]() |
0901 Junior | Technical two-tone (ver. 2) | Part of a Schools & Vocational series but later version with additional K scale |
![]() ![]() |
0902 JuniorTrig | Technical two-tone | Part of a Schools & Vocational series |
![]() ![]() |
0903 LL Scholar | Technical/Log-Log two tone (ver. 1) | Part of a Schools & Vocational series + LL suffix = Log Log + version without BI & LL1 scales but with cm & inch scales on back |
![]() ![]() |
0903 LL Scholar | Technical/Log-Log two tone (ver. 2) | Part of a Schools & Vocational series + LL suffix = Log Log + later version with additional BI & LL1 scales |
![]() ![]() |
0903 Scholar | Rietz-like two tone (ver. 2) | Part of a Schools & Vocational series + version with a more Rietz layout (e.g. L scale at top) but without later additional BI scale + cm & inch scales on back |
![]() ![]() |
0903 Scholar | Rietz-like two tone (ver. 3) | Part of a Schools & Vocational series + later version with additional BI scale |
![]() ![]() |
0903 VS Scholar | Technical two-tone (ver. 1) | Part of a Schools & Vocational series + early version with simplex cursor + VS suffix = “Verschoben Skalen” or folded DF & CF scales |
![]() ![]() |
0903 VS-2 Scholar | Technical two-tone (ver. 1) | Part of a Schools & Vocational series + early version without BI scale + VS suffix = “Verschoben Skalen” or folded DF & CF scales + -2 suffix = second issue of VS model now with duplex cursor |
![]() ![]() |
0906 LL BiScholar | Technical/Log-Log | Part of a Schools & Vocational series + LL suffix = Log Log & Bi prefix = an S scale on stock & slide - see also demonstration slide projector sibling |
![]() ![]() |
0908 TriLog | Technical/Log-Log two tone (ver. 1) | Part of a Schools & Vocational series + early version with T1 & T2 scales |
![]() ![]() |
0929 MultiRietz | Technical two-tone | Later reissued with amended layout as MultiTrig version |
![]() ![]() |
0968 Studio | Technical/Log-Log two-tone (ver. 1) | Later version has T1 & T2 scales |
![]() ![]() |
0968 Studio | Technical/Log-Log two-tone (ver. 2) | Earlier version has no T1 & T2 scales |
![]() ![]() |
0969 StudioLog | Technical/Log-Log two-tone | Extra wide body & impressive complement of scales |
![]() ![]() |
0970 MultiLog | Technical/Log-Log two-tone | Extra wide + Multilog v/s Studio = extra LL00 & LL0 scales - see larger desktop sibling |
![]() ![]() |
0971 HyperboLog | Log-Log Hyperbolic | Rich complement of scales |
![]() ![]() |
10071 | Lighting - System Herbrechtingen | Special commission for German lighting company OSRAM for calculating for calculating lifespan of filament lightbulbs + Table of values on back - see also later & wider version |
![]() ![]() |
101 Junior | Demonstration OHP School/Technical | Overhead projector version for model 0901 - see also Classroom version - part of a Schools & Vocational series |
![]() ![]() |
10181 | Pocket Basic | Special commission for defunct German textile company F.C. Bayerlein + many conversion style gauge marks |
![]() ![]() |
1055 Commerz I | Desktop Business | Series of imperial to metric conversion gauge marks on lower front face + s-d-£ scale is folded - inch scale on back & 25cm (no. 955) & 12.5cm (no. 845) versions also made |
![]() ![]() |
1067 U Darmstadt | Desktop Darmstadt | Co-branded D&P name in well of stock - inch scale on back |
|
1067 U Darmstadt | Desktop Darmstadt | inch scale on back |
|
109 Rietz | Desktop Rietz | Co-branded D&P name in well of stock |
|
168 Studio | Demonstration OHP Technical/Log-Log | Overhead projector version for models 868 & 0968 - Studio = range for more technical disciplines |
![]() ![]() |
206/1&2 BiScholar | Demonstration School 35mm Slide Projection Set | 44nd anniversary gift from Ros - boxed set of two lantern slides specifically for manual feed 35mm photographic slide projector - BiScholar = range where a Sine scale is included on stock & on slide - see also standard 0906 sibling |
![]() ![]() |
30050 Lindell "55" | Desktop Transversal Planimeter | No slide - specially commissioned by Finnish stationers Ab Herman Lindell Oy - for measuring distances/areas - cursor extension suggests results were transposed for further working - name Herman Lindell + “import” & “copyrighted” in Finnish on the back |
![]() ![]() |
301 Junior | Demonstration School/Technical | Later Classroom version for model 0901 - see also OHP version - part of a Schools & Vocational series |
|
303 LL Scholar | Demonstration School/Log-Log | Later Classroom version for model 0903 LL - Scholar = general schools range |
|
60115 HOHLUX | Photography | Specially commissioned for German photographic suppliers Hoh & Hahne - HOHLUX was one of their band names. |
![]() ![]() |
60126 RADAR-WIND | Desktop Military Artillery Range Finding/Meteorology | Specially commissioned by Bundesamt für Wehrtechnik und Beschaffung (BWB) as modern day mit Strichteilung version (inner scales calibrated in 6400 milliradians or MILS) of High Altitude Calculator for German Armed forces (NATO NSN No.: 6660-12-140-6737) for global missile trajectories or possibly jet stream & its effect on missiles/planes flying at high altitude |
![]() ![]() |
60147 Waerme- und Dampfpreis-Kalculator | Fuel Prices (ver. 4) | Special commission for oil major ESSO - 2 nomograms for heating oil & D&P/Aristo co-branding on back |
![]() ![]() |
60168 Stahlgewichtsrechner | Steel Weight Calculator | Special commission & registered design for German steel foundry Stahlwerke Bochum & Lichtenberg for calculating weight of steel bars, sheets & strips + Table of factors on back of envelope |
![]() ![]() |
60190 Gradtag | Desktop K Factor Heating Oil Supply | Specially commissioned by BP Germany for calculating supply requirements of household heating/fuel oil - K Factor is a way of showing (litres/degree day) how fast a consumer uses heating oil (analogy = fuel consumption of a car) |
![]() ![]() |
604 Prozent-Rechner | Pocket Basic Retail | Mark-up & discount percentage scales |
![]() ![]() |
615 Aviat | Aviation | For calulating speed, time, distance & fuel consumption + Co-branded D&P name on back |
![]() ![]() |
620 | Basic | Mini finger holes to help turn inner disc |
![]() ![]() |
622 Calculator | Enhanced Mannheim without Trig scales two-tone | Good for basic calculations but missing Trig scales |
![]() ![]() |
623 Commerz III | Business two-tone | Layout festooned with guage marks for imperial weights & measures |
![]() ![]() |
670 NSU | Pocket Keyring/Time-Speed-Distance Travel Calculator | NSU = German motorcycle & later car manufacturer - conventional time-speed-distances for motorists with km/hour on front & metric fuel economy Litres/100 km on back + B&W version also made & sibling 671 model calibrated for imperial miles & gallons |
![]() ![]() |
803 MonoRietz | Pocket Rietz two-tone | Gets its Mono name from all scales on front face + chrome pouch clip … read more |
![]() ![]() |
810 Puck | Lilliput Enhanced Rietz-like | 1 mini-cursor window in back |
|
812 Simplex | Pocket Enhanced Mannheim | Co-branded D&P name in well of stock + mini-cursor window & CALTEX branding in back |
|
815 Elektro | Pocket Electro | Unusually W & V scales on front face |
![]() ![]() |
860 | Pocket Darmstadt | Unusual stripped down cheaper version of 867 U (hence box + instructions) reputedly for other companies/makers to add their own branding |
|
867 U | Pocket Darmstadt | Aristo Darmstadt printed on back |
|
867 U | Pocket Darmstadt - early | Aristo Darmstadt & Dennert & Pape Hamburg printed on back |
|
868 Studio | Pocket Technical/Log-Log two-tone (ver. 1) | See also larger siblings & desktop sibling |
![]() ![]() |
868 Studio | Pocket Technical/Log-Log two-tone (ver. 2) | See also larger siblings & desktop sibling |
![]() ![]() |
89 | Pocket Rietz | Cursor window + 1 hairline & company logo for German-based company Nilos producing conveyor belt equipment in back |
![]() ![]() |
89 Rietz | Pocket Rietz | Inch scale + cursor window + 1 hairline & sieve size table for defunct German wire weaving company F. Oberdorfer in back |
![]() ![]() |
890 Rietz | Pocket Rietz | Compared to sibling twin model 89 has magnifying cursor & peripheral hairlines |
|
90107 | Lighting | Special commission for German lighting company OSRAM for calculating for calculating lifespan of filament lightbulbs + Table of SCE values on back - see also earlier & narrower version |
![]() ![]() |
90184 | Steel | Special commission for German steel foundry BAU-STAHLGEWERBE for calculating sizes of various steel products |
![]() ![]() |
90192 | Textile | Specially commissioned by Swiss company Rieter suppling machines/systems for making yarn + specialist scale in well of stock + cm scale & Table of constants on back |
![]() ![]() |
911 Simplex | Mannheim | ![]() ![]() | |
914 Elektro | Electro | V & W scales in well + inch scale on back + Aristo (well) & D&P (back) co-branding - later replaced by 915 |
![]() ![]() |
915 Elektro | Electro | Replaced 914 + rubber feet on back |
![]() ![]() |
918 Kanalisation | Pipe Flow in sewerage pipes - System Vicari | Pipe flow calculations based on simplified Kutter formula with n=0.35 circular and ovoid sewers with h/b = 3/2 |
![]() ![]() |
939 Stahlbeton | Reinforced Concrete - System Göttsch | Version for 1200 - 2600 range + Table of factors & pictograms on back |
![]() ![]() |
940 Stahlbeton (DIN 1045) | Reinforced Concrete - System Göttsch | Extra wide body & very complex to use + Table of factors & pictograms on back |
![]() ![]() |
945 Praktiker | Business | PRAKTIKER & Dennert & Pape Hamburg in well + inch scale on back |
![]() ![]() |
956 Bildflug | Photography | Specialist model for aerial photography |
![]() ![]() |
965 Commerz II | Business | ![]() ![]() | |
968 Studio | Technical/Log-Log two-tone (ver. 1) | Early version with unusual edge scales & without D scale added to later version |
![]() ![]() |
968 Studio | Technical/Log-Log two-tone (ver. 2) | Later version with additional D scale |
![]() ![]() |
970 MultiLog | Technical/Log-Log two-tone | Multilog v/s Studio = extra LL00 & LL0 scales - see also larger sibling |
![]() ![]() |
99 | Rietz (ver. 1) | Standard all white closed frame plastic back plate with 2 cursor windows but other versions had clear plastic back plates |
|
99 | Rietz (ver. 2) | Clear plastic closed frame plastic back plate making cursor windows superfluous - other versions had all white plastic back plates |
![]() ![]() |
99 Rietz | Demonstration/Display Rietz | 100% Geretsried made dummy - slide does not slide - “Ausstellugsmuster” on back |
|
99 Rietz | Demonstration/Display Rietz - early | 100% dummy - slide indented but does not slide - “Ausstellugsmuster” on back |
|
M 66 | Universal Electronic Calculator | Non-programmable with 9-digit display based on earlier M 42 |
|
M 85 | Scientific Electronic Calculator (ver. 1) | Non-programmable with algebraic data entry &12-digit display offering more than the M 75 |
|
Aston & Mander | |||
Model | Type | Comments | Thumbnail |
Hill's | Artillery for Indirect Fire | Arm length 26” scale, a table for fuse rating of 18pr for ranges <2000 yards, a Flight of Time (T of F) table in seconds/thousand yards & a synopsis of “Orders” on back |
![]() ![]() |
Aston, J. | |||
Model | Type | Comments | Thumbnail |
Carpenter Timber No. 22060 | Joint 2-fold Tunnel-hinged Coggeshall | D GIRT line = 4–40 with IMPL GAL gauge point - unbranded but font & model numbering identical to known J. Aston + two-entry ½ & ¼ scale table on front + E & M scales (split over 2 legs) on back. |
![]() ![]() |
Aston, T | |||
Model | Type | Comments | Thumbnail |
Hawthorn Engineer | Joint 2-fold Old Arched-hinged Coggeshall | D Girt line = 4-40 + structural conversion & material gauge marks on front + “Extreme Strain” tables of material compression strengths & conversion measures on back |
![]() ![]() |
AstroCart | |||
Model | Type | Comments | Thumbnail |
Eise Eisinga Planetarium | Desktop Astronomy - Northern Hemisphere | Slide chart made for the Eise Eisinga Planetarium (oldest still working planetarium) to calculate star positions & star signs for given date & time as seen from The Netherlands |
![]() ![]() |
AWF (Ausschuss fuer Wirtschaftliche Fertigung) | |||
Model | Type | Comments | Thumbnail |
SR 701 | Machining Time poly-slide (2) - early | made by Hans Seehase to design (1928-1930) by Friedrich Bahlecke - table of factors on back |
![]() ![]() |
SR 702 | Belt Performance & Belt Speed poly-slide (2) | made by Hans Seehase to design (1928-1930) by Friedrich Bahlecke |
![]() ![]() |
SR 704 | Load Capacity of Springs | made by Hans Seehase to design (1930) by Friedrich Bahlecke - often used in combination with its SR 705 sibling |
![]() ![]() |
SR 710 | Bowing/Bending of Beams (metal or wood) poly-slide (2) | made by Hans Seehase to design (1931) by Friedrich Bahlecke - bottom scale = pictograms + Moment of Inertia table of constants on back |
![]() ![]() |
SR 715 | Rivets for Steel Construction | made by Hans Seehase to design (1931) by Friedrich Bahlecke & R. Jacki |
![]() ![]() |
SR 722 | Water Line Capacity | made by Hans Seehase to design (1934) by Helmut Lummert & Friedrich Bahlecke - according to Lummert formula |
![]() ![]() |
SR 726 | Gas Pipe Line Calculator for High & Low Pressure poly-slide (2) | made by Hans Seehase to design (1936) by Helmut Lummert - SG & Conversion tables on back |
![]() ![]() |
SR 751 | Blank but with hand-drawn scales for Machining | made by Hans Seehase - now part of the impressive AWF collection of fellow collector Karl Kleine |
![]() ![]() |
Baird & Tatlock | |||
Model | Type | Comments | Thumbnail |
Richmond's Improved | Milk | Retailed by Dairy Supply Co. Ltd. - designed by Henry Droop Richmond (1867 – 1931) for calculating milk yields according to lacto(hydro)meter SG readings & formula on back - where T = % total solids, G = specific gravity @ 60ºF & F = % fat |
![]() ![]() |
Bate, Robert Brettell | |||
Model | Type | Comments | Thumbnail |
(NoName) | Alcohol Proof | Unmarked but identified by Tom Wyman + layout on back merely extends range from front - possibly out of a Sikes Hydrometer set or modern replica |
![]() ![]() |
Berville, P. | |||
Model | Type | Comments | Thumbnail |
(NoName) | Pocket Mannheim | Probably made by MARC (OEM of No. 2) - inch scale & Werf Gusto. Firma A.F. Smulders, Schiedam on back |
|
Billeter, Julius & Ernst | |||
Model | Type | Comments | Thumbnail |
A1 | Basic | ![]() ![]() | |
W 10 | Desktop Basic long-scale | ![]() ![]() | |
W 4 | Desktop long-scale | Missing chrome turning knob - based on drum-based design patented in 1894 (US513172) & tradition of drum-type Swiss makers |
![]() ![]() |
BIOMATE (UK) Ltd. | |||
Model | Type | Comments | Thumbnail |
Biomate | Biology | Patented design (GB1446576) by A.F. Green for finding biorhythms (for ages 1 to 80) for any given day of the year - late 19th century theory (no proven scientific basis) developed by German physician Wilhelm Fliess for 3 biorhythm cycles: physical (red 23-day cycle), intellectual (green 33-day cycle) & emotional (blue – 28-day cycle) |
![]() ![]() |
Blundell Brothers/Rules Ltd. (BRL) | |||
Model | Type | Comments | Thumbnail |
## Double Sharp | Steel Weight Calculator (Model A) | Made for James Austin & Sons, Dewsbury, UK - slide behind a window rather than closed frame - table of decimal equivalents of fractions in well of stock - steel bar & sheet conversion aids on back of slide & stock - see Skid Stick No. 10, February 2001 |
![]() ![]() |
0552-160219 | Military Torpedo Bearing Rate (Mark I Model 0) | Naval instrument (6605) for British MoD (National Stock Number: 6605-99-462-3859) for calculating gyro settings based on speed/angle/range for straight-running torpedoes |
![]() ![]() |
0552-160221 / P2297 | Military Torpedo Spreading poly-slide (2) | Naval instrument (6605) for British MoD (National Stock Number: 6605-99-462-3861) for calculating the optimum spread of straight-running torpedoes |
![]() ![]() |
304 | Academy Darmstadt | White end-braces on back of stock |
|
308 | Academy Accountant's and Business | For per-decimalisation £,s,d (UK went decimal 1971) |
![]() ![]() |
310 | Pocket Academy Basic | Conversion fan table on back |
![]() ![]() |
312 | Pocket Academy Rietz-like | Unbranded but with RB Excavators & Cranes printed on back - RB = Ruston Bucyrus a now defunct British manufacture of cranes, excavators & drilling rigs |
|
644944 / P5284 | Radiac Nuclear Fission Products poly-slide (2) | Hazard-Detecting Instruments and Apparatus (6665) for British MoD (99) Stock Number (911-0027) © Admiralty Research Laboratory, UK for calculating external radiation doses + scales on front of slides for air contamination & on the backs for sea water contamination - RADIAC = Radio-Activity Detection, Identification & Computation - read more …. |
![]() ![]() |
6665-110060 (ver. NL) | Radiac Nuclear Radiation Calculator No.1 for land | Smaller Dutch version for calculating radiation contamination on land in training exercises |
![]() ![]() |
6665-110117 (ver. NL) | Radiac Nuclear Radiation Calculator No.1 for land | Later larger Dutch version of 6665-110060 for calculating radiation contamination on land in training exercises |
![]() ![]() |
6665-99-911-0117/0060 | Radiac Nuclear Radiation Calculator No.1 | Designed by William Orr (1951) + BRL Mod/NSN Nr.:6665-99-911-0060 made for British & Canadian Governments + intermediate & inner discs are double-sided: (i) pink for contamination over LAND & (ii) blue for contamination generated at SEA - centre split washer to flip sides |
![]() ![]() |
80543 | Omega Artillery Mils (MK2) | Fire Control Computing Sights and Device (1290) for British MoD - National Stock Number: 1290-99-960-0933 - Trig scales are in Mils (6400 mils = 360 degrees) |
![]() ![]() |
AG2 | Rietz-like | Replacement for G.2 model - tensioning pins in edge & cm scale on back | |
AL6 | Log-Log | Replacement for L.6 model - tensioning pins in edge & inch scale on back | |
Blakeborough | Valve Sizing | Model name = Joseph Blakeborough & Sons Ltd. - West Yorkshire engineering business (1866-1989) specialising in design & manufacture of industrial water valves - for choosing correct size valve based on a calculated flow coefficient |
![]() ![]() |
C24 D | Cost & Profit Reckoner Retail | Model suffix “D” denotes later model with all-plastic 1-piece moulded “Diakon” cursor |
![]() ![]() |
E.18 Electricians | Electro | 1 of 3 follow-on models replacing earlier E.3 Bakelite Electro - 2 slide tension adjustment screws on botton side edge + cm scale & patent no. 644944 on back |
![]() ![]() |
E.3 | Electro | Conversion table on back - Batch No. 299 + tensioning pins - read more ... |
![]() ![]() |
G.1 | Student Enhanced Mannheim without Trig scales | Cheaper model with no stove enamelling on the back - Batch No. 533 + tensioning pins - read more ... |
![]() ![]() |
G.1 (reject) | Student Enhanced Mannheim without Trig scales | Batch No. 101 - top front edges shaved off & “SUBSTANDRD” stamped in back - one of many as “waste rate” was +/- 50-60% of all production! - read more ... |
![]() ![]() |
G.2 | Enhanced Mannheim without Trig scales | Conversion table on back. Batch no. 1779 + tensioning pins - read more ... |
![]() ![]() |
G.2 | Enhanced Mannheim without Trig scales - early | Plain back - No batch no. - read more ... |
|
G.5 | Enhanced Mannheim | Conversion table on back - Batch no. 365 + tensioning pins - read more ... |
![]() ![]() |
Holophane | Angle Lighting Calulator | Batch No. 1952 + tensioning pins - read more ... |
![]() ![]() |
Holophane | Illumination Lighting Calculator | Batch No. 655 + tensioning pins - read more ... |
![]() ![]() |
L.4 | Log-Log | Conversion table on back - Batch No. 316 - read more ... |
![]() ![]() |
L.6 | Log-Log | Company name “Taylor Woodrow”+ conversion table on back - Batch No. ?51 + tensioning pins - read more ... |
![]() ![]() |
Laker | Cutting Speed/Feed Calculator | Design copyrigh: Firth Brown Ltd - batch No. 249 + table constants & conversion factors on back - read more ... |
![]() ![]() |
P.8 | Pocket Mannheim | Conversion table on back - Batch No. 591 - read more ... |
![]() ![]() |
P.8 | Pocket Mannheim - early | Mottled/fading of enamel - Batch No. 337 - read more ... |
![]() ![]() |
P.8 | Pocket Mannheim - late | Conversion table + ICL COMBUSTION on back- Batch No. 1843 - read more ... |
![]() ![]() |
P1409 | Holophane Illumination Calculator | First order by Holophane Ltd. to replace the original two BRL lighting bakelite models: (i) Illumination Calculator & (ii) Angle Calculator - the possible inspiration for Blundell’s highly successful “P” series. |
![]() ![]() |
P1418 | Shell-Mex & BP Room Volume Calculator | Made for Shell-Mex/BP (SMBP) Ltd |
![]() ![]() |
P1442 | Shell-Mex & BP Friction Loss Calculator | Made for Shell-Mex/BP (SMBP) Ltd - conversion constants on back |
![]() ![]() |
P1454 | Pipe Flow | Made for ICI (no. 230) - nomograms and a table on the back |
![]() ![]() |
P1470 | Conversion | Slide chart for metric to imperial conversions made for: Loughborough Glass Co. + table of conversion factors on back - based on earlier M1759 design |
|
P1553 | Armstrong Calculator for Flooring | Made for Armstrong Cork Co. Ltd., London for calculating cost in sq. yards/feet to tile a floor area and/or the number of 9” x 9”/12” x 12”/18” x 18” floor tiles needed - grey end-braces on back of stock |
![]() ![]() |
P17 | Log-Log | One of replacements for P.8 model - cm scale on back | |
P1732/A | Fisher Universal Valve Sizing Mark III F | Copyrighted French version made for Elliott Automation based in Paris |
![]() ![]() |
P1960/B | Paint Calculator (folded £-s-d scale) | Made for Sissons Brothers & Co. Ltd., Hull, UK - grey end-braces on back of stock - spreading/coverage rates for types of Sissons’ household paints on back |
![]() ![]() |
P2245 | Textile | Slide chart for yarn count conversions made for Bentley Group, UK |
![]() ![]() |
P2304 | Paper Substance Calculator | Promotional give away made for commercial paper manufacturer & merchant: The Wiggins Teape Group, High Wycombe, UK for calculating length & weight of a reel for a given weight of paper (grams/m2 ) & width - grey end-braces on back of stock |
![]() ![]() |
P2327 (P4409) | Percentage Overlap on Metal Seams | Made for Metal Box Co. (MB) - P2327 old no. for Halden version but MB version should be P4409 |
![]() ![]() |
P2808 | Ultrasonic poly-slide (2) for testing metal buttt welds | Original training/testing version made for inventor J.W. Fox (Brit living in USA - hence American 1967 © design) & Schoool of Applied Non-Destructive Testing, London (SANDT) - design later sold to M. Falk & Co & a simplified version (using standard components & a duplex cursor) reissued as BH P4366 |
![]() ![]() |
Paper Facts & Figures | Paper Calculating Rule | Unmarked reused Academy 300 series blank for Paper Facts & Figures Ltd. - © specialised scales/method for paper distribution calculations by paper buyers, estimators, etc. - unusually open frame construction scales also on back |
![]() ![]() |
S.101 | Pocket Rietz-like | No BRL branding but special commission (without trig scales) for motorsport company Charles Vandervell (CAV - that later became Lucas CAV) |
|
T.12 Technicians | Log-Log | Unusual folded scales layout + two patented (GB644944) slide tension adjustment screws in bottom side edge + cm scale on back |
![]() ![]() |
T.20 Technicians | Desktop Log-Log | No batch number but 4 tensioning pins & 4 chiselled out recesses in each end of top & bottom side edges to combat Bakelite shrinking problems + plain Bakelite back - read more ... |
![]() ![]() |
T.50 | Janus Multi Log-Log | Janus logo = dual-faced (future & past) Roman god of beginnings & transitions |
![]() ![]() |
U.7 Universal | Log-Log | Conversion table on back. Batch No. 609 + tensioning pins - read more ... |
![]() ![]() |
Blundell Harling Ltd. (BH) | |||
Model | Type | Comments | Thumbnail |
0490.37 | Conversion | Slide chart for converting various imperial units into metric |
![]() ![]() |
0490.45 | Mixology | Slide chart for mixing 44 different cocktails - possibly later reissued as P5225 & P5335 - with double no. of cocktails but uncannily similar to IWA version |
![]() ![]() |
500 | Academy Log-Log | Unusual layout of scales & highlighted yellow strips on cursor for reading off A/B & C/D scales on front & C/D scales on back |
![]() ![]() |
6665-99-780-8137 | Radiac Nuclear Radiation Calculator No.1 Mk2 | Later variant of BRL Mod/NSN Nr.:6665-99-911-0060 version + intermediate & inner discs are double-sided: (i) pink for contamination over LAND & (ii) blue for contamination generated at SEA - centre split washer to flip sides |
![]() ![]() |
6B/1112682 | Hercules C.Mk.1 Aviation Trim Computer | Made for UK MoD & designed by H.O.A.S.C. Operation Research department of RAF - table of fuel movements on back |
![]() ![]() |
802 | Academy Log-Log | ![]() ![]() | |
803 | Academy Rietz | B & C scales highlighted in yellow |
|
812 | Pocket Classmate Academy Rietz | ![]() ![]() | |
813 | Classmate Academy Rietz | ||
904 | Academy Darmstadt | Same construction as Academy 800m series but with double-sided interlocking convex cursor |
![]() ![]() |
905 | Academy Log-Log | Same construction as Academy 800m series but with double-sided interlocking convex cursor |
![]() ![]() |
Allied Colloids | Pocket Rietz | Special commission for Allied Colloids - a UK speciality chemicals company |
|
M5572 | Lilliput Conversion | Slide chart for metric to imperial conversions but made as a business card for BH Technical Director Peter Soole who joined the company in 1960 |
![]() ![]() |
M899 | Pocket Electro Power Factor calculator | Slide Chart made for British Insulated Callender’s Cables Ltd (BICC) - © UKP/7M/262 on back |
![]() ![]() |
NL 11-95 | Pocket Basic Memorial | 1 of only 100 made especially for the IM1995 - the inaugural Int. meeting held in NL |
![]() ![]() |
P2734A | Fisher Universal Valve Sizing Mark V | Copyrighted version made for GEC-Elliott Valves Limited |
![]() ![]() |
P3679 | Music Chord Computer | Slide chart specially commissioned by UK copyright holder Dudely Fulller Associates - design invented by musician Dudley Fuller |
![]() ![]() |
P4099 | Holophane Illumination & Angle Calculator (metric) | Last order by Holophane Ltd. to replace the original two BRL lighting bakelite models: (I) Illumination Calculator & (ii) Angle Calculator - the possible inspiration for Blundell’s highly successful “P” series. |
![]() ![]() |
P4463 | Holophane Illuminanace & Angle Calculator | Last order by Holophane Europe to replace the original two BRL lighting bakelite models: (I) Illumination Calculator & (ii) Angle Calculator - the possible inspiration for Blundell’s highly successful “P” series. |
![]() ![]() |
P4743 | Fisher Universal Valve Sizing Mark VIII | Copyrighted version made for Fisher Controls |
![]() ![]() |
P4985 | Chemical | 2-set slide chart (based on an old design) specially commissioned by METREC Metals Recycling b.v. for recycling non-ferrous metals |
![]() ![]() |
P5092 | Oil Fuel Viscosity-Temperature Calculator | Special commission by British Petroleum (BP) Trading Ltd. - later P5128 sibling version with cosmetic differences |
![]() ![]() |
P5128 | Oil Fuel Viscosity-Temperature Calculator | Unbranded but clearly a BH special commission by British Petroleum (BP) - earlier P5092 sibling version with cosmetic differences |
![]() ![]() |
P5154 | Beer/Lager Retail Price Calculator | Slide chart made for Courage Brewery - front for draught/barrel beers/lagers & back for bottled beers/lagers - unusually it integrates the Value Added Tax (VAT) |
![]() ![]() |
P5527 | Roof Pitch Indicator | Slide chart made for Marley / Chestnut Roofing Supplies Ltd |
![]() ![]() |
P5731 | Music Note Tracker | Slide chart made for UK patent holder (GB2245409) Peter Davies. |
|
P5798 | Pocket Dietary | Slide chart specially commissioned by Glubay to calculate an individuals Body Mass Index (BMI) based just on metric height & weight |
![]() ![]() |
P5939 | Conversion | Slide chart for imperial GBP prices to metric equivalents |
![]() ![]() |
P6290 | Refrigerant | Slide chart specially commissioned by ALKLIMA/MITSIBUTI ELECTRIC for air condition units |
![]() ![]() |
Robert Jenkins Co. Ltd | Pocket Tank Capacity Calculator | Unbranded but identical to earlier BRL/BH “P” versions - design by Alan Menmuir - |
![]() ![]() |
S143-10 | School Rietz without Trig scales | ||
S150-10 | School Rietz | ||
S150-20 | Pocket School Rietz | ||
Victor K MK. 2 | Aviation | Load adjuster extra wide & unbranded for a British jet-powered Handley Page Victor K (V-shaped) bomber used by RAF + nomogram in well |
![]() ![]() |
W.H. Smith | Student Log--Log | One of three generic BH-made models sold by UK retailer/stationer W.H. Smith |
|
Booth, W. & Co. | |||
Model | Type | Comments | Thumbnail |
(NoName) | Hatters Gauge | Retailed by an Australian General Drapers, Tailors & Outfitters - read more … |
![]() ![]() |
BOOTS / RINGPLAN | |||
Model | Type | Comments | Thumbnail |
Standard | Pocket Rietz-like | Bottom Inch scale inverted - OEM probably made by FUJI (pocket model 535s) |
![]() ![]() |
Bradburn & Sons, T. | |||
Model | Type | Comments | Thumbnail |
Carpenter Timber | Joint 2-fold Bradburn's Bolted-hinged Coggeshall | D Girt line = 4-40 + five-entry ¼ to INCH scale table on front + Lion trade mark + half-length E & M scales (split over 2 legs) on back |
![]() ![]() |
Brevetti Lanza | |||
Model | Type | Comments | Thumbnail |
Addimat | Wheel Adder | Basic version just for addition from patented design by Sergio Lanza |
![]() ![]() |
British Engraving and Nameplate Manufacturing | |||
Model | Type | Comments | Thumbnail |
Bonwitt 5403 | Log-Log | Maker only made 4 Bonwitt models - British Engraving (with Edward Holliday) granted patent GB618135 in 1949 for an engraving method - meaning of Bonwitt model name prefix unknown |
![]() ![]() |
British Slide Rule Co. | |||
Model | Type | Comments | Thumbnail |
The Supreme | Student Log-Log | Tables of conversion constants on back |
![]() ![]() |
The Technical Standard | Log-Log | Tables of conversion constants on back |
![]() ![]() |
Burrows, W. & J. | |||
Model | Type | Comments | Thumbnail |
(NoName) | Alcohol Proof | More likely retailer than maker + layout on back merely extends range from front |
|
Buss, Thomas Odempsey | |||
Model | Type | Comments | Thumbnail |
(NoName) | Alcohol Gauging, Ullaging & Reducing poly-slide(2) | Front face for Gauging & Ullaging calculations & reverse side for Reducing & Stocktaking calculations + other known examples always part of spile rod set |
![]() ![]() |
Sikes' 42300 | Alcohol Hydrometer set | Scale runs form 0 -10 + full set of 9 brass weights (10 - 90) all stamped: 42300 |
![]() ![]() |
Carbic Ltd / Otis King | |||
Model | Type | Comments | Thumbnail |
Fischer (or Fisher) Cylindrical Calculator | Helical long-scale | Invented & patented (GB778556) by Rafael Fischer in 1957 + full-length open ended plastic sleeve with 4 red positioning arrows & red endcap that works in conjunction with cursor sleeve - read more … |
![]() ![]() |
Model K 2nd version | Pocket 07 helical long-scale white on black | Serial No. B1086 - both the presentation box & white on black paper scales are rare |
![]() ![]() |
Model K 2nd version | Pocket 11 helical long-scale brass | Serial No. P2601 - brass sleeve probably only result of original black paint wearing off |
|
Model K 2nd version | Pocket 12 helical long-scale | Serial No. S0702 |
![]() ![]() |
Model L 4th version | Pocket 03 helical long-scale | Serial No. A8920 |
|
Model L 4th version | Pocket 13 helical long-scale | Serial No. Z3168 |
![]() ![]() |
Model N | Pocket 03 Retail & Monetary long-scale white on black | Serial No. 6998 - model, presentation box & white on black paper scales are rare |
![]() ![]() |
Casella, L.P. | |||
Model | Type | Comments | Thumbnail |
(NoName) | Desktop "prototype" | Stamped CASELLA but possibly made by UK maker W.H. Harling - upside-down scales on the slide probably a design feature when inverting the slide - read more ...
|
![]() ![]() |
Anderson Improved | Long-scale extra precision | Three extended non-standard scales (Patent GB190309095 - Major F.J. Anderson) respectively folded 4/4/7 times for extra precision + “Supplied by W.H. Harling” blind-stamped in back + 778 stamped in left-hand side edge |
![]() ![]() |
Clements Newling & Co. Ltd. | |||
Model | Type | Comments | Thumbnail |
(1464) | Hatters Gauge | OEM version made by John Rabone & Sons for well-known UK reseller - read more … |
![]() ![]() |
Co Atpress | |||
Model | Type | Comments | Thumbnail |
Het Ei van Co | Music Chords | Slide chart (later version) copyright designed & retailed by Co Atpress (“coat press” nickname = pseudonym for Kees Jaspers) for simply finding any chord on any string or keyboard instrument + Kees was a a bassist & member of Dutch bands Down Town Jazz Band, Dixieland Pipers & Dutch Swing College Band |
![]() ![]() |
Het Ei van Co | Music Chords - early | Slide chart copyright designed & retailed by Co Atpress (“coat press” nickname = pseudonym for Kees Jaspers) for simply finding any chord on any string or keyboard instrument + Kees was a bassist & member of Dutch bands Down Town Jazz Band, Dixieland Pipers & Dutch Swing College Band |
![]() ![]() |
Color Wheel Company | |||
Model | Type | Comments | Thumbnail |
3459 Watercolor Wheel | Desktop Colour Mixing - early | Slide chart (still sold) designed to assist artists in mixing watercolours & to achieve colour harmonies |
![]() ![]() |
CONCISE (K.K. Konsaisu) | |||
Model | Type | Comments | Thumbnail |
26A | Pocket Enhanced Mannheim without Trig scales - early | Combined slide rule/slide chart specially commissioned by Japanese engineering company Chiyoda + conversion factors on back + removable data card with weight, length, square (area) & cubic/capacity conversion tables |
![]() ![]() |
271 | Rietz-like | Specially commissioned by office equipment company TAMAYA |
![]() ![]() |
28 | Pocket Enhanced Mannheim without Trig scales | Specially commissioned by Japanese drawing instruments company Takeda + conversion factors on back + double-sided cursor is superfluous as nothing to calculate on back |
![]() ![]() |
28N | Pocket Enhanced Mannheim without Trig scales (ver. 1) | Minor differences to earlier model 28 = simplex cursor & CI scale in red + fan-style conversion factors on back |
![]() ![]() |
28N | Pocket Enhanced Mannheim without Trig scales (ver. 2) | Minor differences to earlier model 28 = simplex cursor & CI scale in red + table-style conversion factors on back - specially commissioned by defunct Austrian company NORMA |
![]() ![]() |
32 | Keyring Basic/Perpetual Calendar | Printed Patent no. 479446 + perpetual calendar (only for 1960 to 1981) |
![]() ![]() |
600 | Pocket Chemical | Combined slide rule/slide chart designed by SAMA & ETANI & specially commissioned by Dutch oil major Shell +periodic table of elements on back + removable data card with length, area, weight, decimal equivalents, volume, velocity, flow rates, gas constants, energy & pressure conversion tables |
![]() ![]() |
CTCS-552 | Pocket Chemical | Combined slide rule/slide chart designed by SAMA & ETANI & specially commissioned by American chemicals company DOW + table of elements & temperature conversion chart on back + removable data card with length, area, weight, decimal equivalents, volume, velocity, flow rates, gas constants, energy & pressure conversion tables - CTCS model name prefix = Conversion Tables & Circular Slide Rule |
![]() ![]() |
EE-112 | Pocket Electronic | Combined slide rule/slide chart designed by SAMA & ETANI & specially commissioned by American engineering company Brown & Root Inc. + reactance nomogram on back + removable data card with length, weight, area, volume, energy power & velocity conversion tables - EE model name prefix = Engineering & Electronic |
![]() ![]() |
Herman van Herwijnen | Pocket Stadia Topography | Specially commissioned memorial edition by defunct online group ISRG for late HvH (1929-2004) + lookup table for correcting distance measurements on front |
![]() ![]() |
Contina AG / CURTA | |||
Model | Type | Comments | Thumbnail |
Type I | Stepped Drum Calculator - System Curt Herzstark | Serial No.: 24587 designed by Curt Herzstark (1902-1988). Highly sophisticated calculating machine based on Leibniz's stepped drum concept - see also smaller Type II sibling. |
![]() ![]() |
Type II | Stepped Drum Calculator - System Curt Herzstark | Serial No.: 545719 designed by Curt Herzstark (1902-1988). Highly sophisticated calculating machine based on Leibniz's stepped drum concept - see also smaller Type I sibling. |
![]() ![]() |
Controller Calculator | |||
Model | Type | Comments | Thumbnail |
(NoName) | Waistcoat Mannheim-like - early | Notably has an inner K scale instead of usual B scale + 3 tables of conversion factors on back |
![]() ![]() |
110 R | Pocket Mannheim-like | Table of conversion factors on back |
![]() ![]() |
75 R | Waistcoat Mannheim-like | Made for F. Krupp - fan chart of constants on back |
![]() ![]() |
75 W | Waistcoat Mannheim-like | Unusual “W” model & monochromic colour scheme + cube chart of conversion factors on back |
![]() ![]() |
Cooper, Charles T. & Sons (Ltd.) | |||
Model | Type | Comments | Thumbnail |
Bachanan | Paper | Promotional gift by defunct wood UK pulp merchant Becker & Co. Ltd. for determining capacity/output of paper-making machines based on 1918 patented design (GB115207) by William Stanhope Buchanan + G. Clapperton name on front face probably refers to George Clapperton who wrote the definitive manual for paper-makers & owners of paper mills + inch/cm scales & Lbs Demy to Lbs DblCern conversion scale on back |
![]() ![]() |
COX & STEVENS Aircraft Corp. | |||
Model | Type | Comments | Thumbnail |
V (M.L. Navigatie-Doos) | Boxed Aviation | 1946 patented design (US2405803) for marine aircraft dead reckoning by Arthur L. Thurston for Dutch market + innovatively built into metal box with switches to change form of calculation (e.g. from flown course to course over ground) with wind, barometric & temperatures scales & speed dial inside lid + wind direction dial, various speed & optional settings & refinements (e.g. degrees of drift) built into main body of box |
![]() ![]() |
Danfoss | |||
Model | Type | Comments | Thumbnail |
(NoName) | Pocket Refrigerant - early | No slide |
![]() ![]() |
(NoName) | Refrigerant | No slide |
![]() ![]() |
520H4713 | Refrigerant | No slide | ![]() ![]() |
Calculator | Heating flue gas losses | Calculations based on a standard calorific value of fuel oil - back of calculator gives fuel oil nozzle capacities | ![]() ![]() |
RT.00.A1.00 | Refrigerant | No slide | ![]() ![]() |
RT.00.A2.00 | Refrigerant | No slide | ![]() ![]() |
RT.0X.A5.00 | Refrigerant | No slide | ![]() ![]() |
DARGUE Bros. Ltd. / Simplon | |||
Model | Type | Comments | Thumbnail |
Bilateral | Log-Log - early | “Half-duplex” layout with scales on back of closed frame stock & extra-wide cursor track for reversing cursor - unmarked & early version of S.B.10 because patent (GB413308) is still pending - read more ... |
![]() ![]() |
S.B. 5 Bilateral | Pocket Enhanced Mannheim - early | “Half-duplex” layout with scales on back of closed frame stock & reversible cursor - pocket version of S.B.10 with LL scales - early version because patent (GB413308) is still pending - read more ... |
![]() ![]() |
S.B.10 Bilateral | Log-Log | “Half-duplex” layout with scales on back of closed frame stock & dual cursor tracks for reversing cursor - read more ... |
![]() ![]() |
S.E.10 (Bilateral) | Electro | “Half-duplex” layout with scales on back of closed frame stock & dual cursor tracks - W & V scales in well of stock - degree (<5˚34’) Tan & degree (70˚-90˚) Sin look-up tables on back of extra wide non-reversible slide with chamfered edge cursor as part of well + table of conversion factors on back - read more ... |
![]() ![]() |
S.M.10 Major (Bilateral) | Log-Log | “Half-duplex” layout with scales on back of closed frame stock - chamfered opening used instead of reversible cursor - degree (<5˚34’) Tan & degree (70˚-90˚) Sin look-up tables also on back of non-reversible slide - divisions on 2 & 1 cycle A & D on back of stock run from 0.01-0.1-1.0 & 0.1-1 + table of conversion factors on back - read more ... |
![]() ![]() |
S.P. 5 Primary | Pocket Mannheim | Pocket version of S.P.10 but without LL & CI scales - extensive table of conversion factors on back - read more ... |
![]() ![]() |
S.P.10 Primary | Log-Log | Extensive table of conversion factors on back - read more ... |
![]() ![]() |
S.R.10 Bilateral | Rietz | Later “Half-duplex” layout with scales on back of closed frame stock & extra wide single track for reversing cursor - read more ... |
![]() ![]() |
SR-2 | Pocket Mannheim | Unusual dirty orange colour plastic = form of bakelite - same as SR-1 except with full-view glass cursor & sturdier construction - unusually with original case - read more ... |
![]() ![]() |
SR-3 | Pocket Uniface Technical | Unusual dirty orange colour plastic = form of bakelite + aluminium strengthening strip on back - “Uniface” type (S & T scales being on front face instead of back of slide) is an innovation others would follow years later - read more ... |
![]() ![]() |
SR-5 | Uniface Technical | Unusual dirty orange colour plastic = form of bakelite - full version of SR-3 + “Uniface” type (S & T scales being on front face instead of back of slide) is an innovation others would follow years later - read more ... |
![]() ![]() |
SR-6 | Enhanced Mannheim | Unusual dirty orange colour plastic = form of bakelite - slide not reversible but 2 windows in the back & aluminium strengthening strip - read more ... |
![]() ![]() |
WR-6 Standard | Enhanced Mannheim | De-Luxe model with plain white celluloid faced slide & back + cm scale on back - 1 of 5 WR models with higher quality finish & higher retail price - read more ... |
![]() ![]() |
WR1-A Selecta | Mannheim | Plain white celluloid faced slide & back - 1 of 5 WR models with higher quality finish & higher retail price - read more ... |
![]() ![]() |
XL-10 (Bilateral) | Log-Log | Later reissued version of S.B.10 with divisions on 2 & 1 cycle A & D on back of stock redrawn to run from 0.01-0.1-1.0 & 0.1-1.0 + famously named Fastest slide in the Whitehall by Arthur C. Clarke - read more ... |
![]() ![]() |
Datalizer Slide Charts Inc. | |||
Model | Type | Comments | Thumbnail |
Chord Board | Music Chord Finder & Key Transposer | Slide chart copyrighted design by Martin H. Samuel - later replaced by a phone App |
![]() ![]() |
David (Emile) | |||
Model | Type | Comments | Thumbnail |
Calculimetre | Watch Charpentier Mannheim | Wonderful 40th Wedding Anniversary present from Ros - made by Charpentier |
![]() ![]() |
David Chandler Co. | |||
Model | Type | Comments | Thumbnail |
The Night Sky | Desktop Astronomy - Southern Hemisphere | Slide chart to calculate star positions & star signs for given date & time + designed to be read at night |
![]() ![]() |
Dennert & Pape (D&P) | |||
Model | Type | Comments | Thumbnail |
14 | Electro | cm scale in well + 3 adjustment screw in bottom side edge |
![]() ![]() |
D 2/28 | Enhanced Mannheim - early | Railway track scales + cm scale & D&P D.R.P. no. 126499 in well & 3 adjustment screws in bottom side edge +- conversion table & 2 open windows on back |
|
D 2/28 | Enhanced Mannheim - short | Short stock length (possibly because shortage of raw materials) with railway track scales + cm scale & D&P Altona & “Patent” in well of stock - conversion table + 2 open windows on back |
|
D 2/28 | Pocket Enhanced Mannheim - late | Possibly transitional example before moving to Astralon & Aristo branding + owned by Emiel Gibas |
|
D 9/28 | Rietz | 3 adjustment screws on bottom side edge - conversion tables on back |
|
DUPA D14.15 | Pocket Electro | Company NAW & model details in well & 2 adjustment screws in the bottom side edge + table of conversion factors on back |
![]() ![]() |
DUPA Line Loss & Voltage Drop Calculator | Electro poly-slide (2) | Copyrighted & patented (US1560599) by Charles C. Moler in 1925 - special commission for The Potomac Edison Company, Maryland, USA (Moler’s employer) - 4 adjustment screws in top side edge - besides preventing voltage flicker on electrical distribution lines it could save money by avoiding expense of higher grade of cable when not needed - read more .... |
![]() ![]() |
DUPA S.90 | Rietz | Possibly an early special commission for H. Linke - PERTODO = D&P trademark for free-view cursor (they wanted RERTOTO from the Latin word “totus” but had to change to PERTODO) - 4 adjustment screws on bottom side edge - conversion tables on back |
|
GWR | Desktop Military Naval Artillery | Instruments for German armed forces during WWII used codes to hide maker’s identity - gwr = D&P + besides solving normal artillery-related distance problems, this naval version also takes into account drift of a moving vessel |
![]() ![]() |
I | Enhanced Mannheim | Table of conversion factors on back |
|
I | Lilliput Enhanced Mannheim | D&P in well + Inch & cm scales on back |
|
I | Pocket Enhanced Mannheim | cm scale & D&P & D.R.P. No. 126499 in well of stock |
|
I | Pocket Enhanced Mannheim - early | D.R.P. No. 126499 in well of stock + inch & cm scales on back |
|
IV | Desktop Enhanced Mannheim | IV = model with 4 adjustment screws in bottom edge - railway track scales - cm scale in well of stock |
|
Präzisions-Kubus-Rechenstab | Squaring long-scale | Uncommon & unusual model with just root & trig scales (all long scales) - one open window with cursor line in back on right |
![]() ![]() |
S 6/28 (System Rietz) | Rietz | DRP No. 126499 in well of stock & 3 adjustment screws in bottom side edge + conversion tables on back + 1 cursor window |
|
DEVCO | |||
Model | Type | Comments | Thumbnail |
Tel-A-Chord | Music Composition & Transposer | Slide chart design by Victor Leone for accordion playing |
![]() ![]() |
Diefenbach | |||
Model | Type | Comments | Thumbnail |
WMN | Pocket Pipe Flow - System Mulder | For water pipes & WMN = Dutch water utility company Waterleidingbedrijf Midden-Nederland + table of flow factors/speeds for various pipe/conduit sizes on back |
![]() ![]() |
Dietzgen | |||
Model | Type | Comments | Thumbnail |
1752P Maniphase | Desktop Rietz-like | Going by style of π gauge mark probably made by D&P + slightly longer slide + 6 adjustment screws & conversion table on back + Maniphase = Dietzgen name for an extended Enhanced Mannheim layout |
|
1765P Basik | Rietz two-tone | Made in Germany + Table of constants on back |
|
1767P National | Enhanced Mannheim | Possibly OEM by Charvoz-Roos or Festus + conversion table on back & 1 cursor window |
|
1768-P Maniphase | Rietz-like two-tone | OEM made in Japan probably by FUJI + Maniphase = proprietary name for extended Enhanced Mannheim layout |
|
1768P Reliance | Enhanced Mannheim | Identical to Charvoz-Roos SR-105M + Table of Equivalents on back & 1 cursor window |
|
1769P Federal | Enhanced Mannheim | Table of conversion factors on back & 1 cursor window |
|
1771 Redirule | Pocket Enhanced Mannheim | Specially commissioned by Dutch heavy industry manufacturer Combinatie Pletterij-Nederhorst but OEM made by Bruning + Redirule = Dietzgen trademark name for pocket slide rules |
|
1776 Redirule | Pocket Technical | Redirule = Dietzgen trademark name for pocket slide rules |
![]() ![]() |
1797A Atlas | Desktop Business long-scale - Type III | Affectionately known as a “circular Gunter” - OEM version made by Gilson with novel clutch design & two cursors meaning a single D scale (effective length: 1067 cm) was sufficient + Trig scales + fraction/decimal conversion scale on back act as lookup “tables” |
![]() ![]() |
Dimier | |||
Model | Type | Comments | Thumbnail |
Electric | Pocket Electro | W scale in well of stock - COMPAGNIE GENÉRALE D'ELECTRO-CÉRAMIQUE & cm scale on back | ![]() ![]() |
Disney (Walt Disney Productions) | |||
Model | Type | Comments | Thumbnail |
Mickey Mouse | Child's Disney World Teaching Aid/Calculator for Simple Arithmetic & Conversions | Child’s arithmetic slide calculator - made in Hong Kong - identical but later version known as: “Mickey Math Slide Rule” |
![]() ![]() |
Slide Matching | Child's Teaching Aid/Toy Puzzle poly-slide (3) | Made by MARX in Hong Kong - tile matching toy puzzle in form of slide rule featuring 8 vintage & much loved Disney characters |
![]() ![]() |
DIWA (Dansk Industri Waterpas A/S ) | |||
Model | Type | Comments | Thumbnail |
1-1 Rietz-Ideal | Rietz | Called Ideal because full complement of Trig scales included on front face |
|
101 Log Log | Log-Log | Veneers attached with screws/pins + table of conversion factors on back with 1 cursor window |
![]() ![]() |
201 Technical (ver.1) | Rietz | Veneers attached with screws/pins + table of conversion factors on back with 1 cursor window |
|
201 Technical (ver.2) | Rietz | Veneers attached with screws/pins + table of conversion factors on back with 1 cursor window |
|
301 Commercial | Enhanced Mannheim | With veneers attached with screws/pins earlier precursor to plastic 301 Rietz + table of conversion factors on back with 2 cursor windows |
|
301 Rietz | Rietz | Table of conversion factors on back with 1 cursor window |
|
361 Log Log | Log-Log | Extra wide + Table of conversion factors on back |
|
501 Rietz | Rietz | 1 cursor window in back |
|
551 Darmstadt | Darmstadt | Unusual layout for Darmstadt |
![]() ![]() |
601 | Pocket Promotional Rietz | Version of 621 but primarily a model for a promotional slide rule - in this case for Danish supplier of light-weight concrete SIPOREX + company details on back with 1 cursor window |
|
601-1 | Pocket Rietz | Later version of 601 + 1 cursor window in back |
|
611 | Pocket Electro | V and W scales in the well of the stock + 1 cursor window in back |
![]() ![]() |
621 Technical | Pocket Rietz | 1 cursor window in back |
|
631 Commercial | Pocket Enhanced Mannheim | Specially commissioned by Swedish company Elektromekano & printed on back + 1 cursor window in back |
|
701 Rietz | Rietz | A “cheaper” model (all scales on front face) for schools + inch scale “upside down” |
![]() ![]() |
710 Teknilog | Technical | Impressive complement of scales but possible OEM by Japanese maker Ushida Yoko |
![]() ![]() |
741 Businessman Export | Technical two-tone | From construction, two-tone nature, scale layout, & cm + inch scale on back OEM by Japanese maker Ushida Yoko |
![]() ![]() |
Draftwell | |||
Model | Type | Comments | Thumbnail |
1005 | Rietz-like | Draftwell probably OZ or NZ-based office supplies reseller - OEM by FUJI but retailed through Hope Slide Rule Mfg. Co. - slide coloured green on front |
|
Dring & Fage | |||
Model | Type | Comments | Thumbnail |
(NoName) | Alcohol Gauging poly-slide(2) | Post 1824 imperial based units/gauge marks + front face bottom slide can be slotted in alongside top slide (hence it only runs to 9.5) for double length i.e. Everard-like + considered by fellow collector David Riches Missing Link between square Everard design & follow-on duplex models - read more ... |
![]() ![]() |
(NoName) | Desktop Alcohol Gauging | Post 1824 because of IM B & IM G gauge marks signify change from Winchester to Imperial based measurement - bottom Seg Ly. scale is for gauging when the cask is lying on its side |
![]() ![]() |
Carpenter Timber | Desktop Coggeshall | Rare duplex Coggeshall with 4–40 GIRT LINE for volumes of round timber + 2 sets of brass gauge pins (marked 0,16, 8 & 8,16, 0 respectfully) for round, 8 or 16 sided timber + INVERTED LINE (AI scale) for volumes of rectangular timber - compared to Langley version layout front & back reversed |
![]() ![]() |
Customs & Excise 482 | Alcohol Saccharometer | Scales run from 55 to 70 (1055/1070) |
![]() ![]() |
Customs & Exercise D-F-52 | Desktop Alcohol Gauging Head Rod | Seg Ly. scale on front face is for gauging when the cask is lying on its side + SPH’D scale on back face is for calculating the spheroid |
![]() ![]() |
Everard | 4-sided Alcohol Gauging poly-slide(4) | Makers No. 248 + pre 1825 because of Winchester based units/gauge marks + back of slide Face “A” = Divisors for various liquids + back of slide Face “B” = scales for correcting calculations for spheroid casks & other models + back of slide Face “C” = more Divisors + back of slide Face “D” = gauge points for various liquids |
![]() ![]() |
Mark VI | Desktop Artillery for Indirect Fire | Serial no. = 36 - called Apparatus for the Observation of Fire was intended for use by lance-corporals & corporals in the field & not on a desk - issued by Min. of Defence (inventory no. 302SB) |
![]() ![]() |
DuPont | |||
Model | Type | Comments | Thumbnail |
(NoName) | Refrigerant | Slide chart pushing ISCEON a non-ozone depleting HFC retrofit refrigerant |
![]() ![]() |
DUVAL, Roger | |||
Model | Type | Comments | Thumbnail |
(NoName) | Desktop Rietz | Little known French maker (Drancy, Paris) - plastic models similar to Graphoplex - unusual wide body + top LL scale not standard for a Rietz making the layout somewhat unconventional |
![]() ![]() |
Electro | Extra-wide-Electro | Little known French maker (Drancy, Paris) with plastic models similar to Graphoplex + unusual extra wide body & striking monochrome scales + W & V scales in well of stock |
![]() ![]() |
E. Gundlach AG | |||
Model | Type | Comments | Thumbnail |
Diamant-Kalkulator | Jewellery Rotary Wheel | Slide chart specially commissioned by Hamburg Diamanthandelsgesellschaft Lenzen & Stormer & Amsterdam diamond dealer H.E. Slijper - calculates relationships between: (i) quality of a diamond, (ii) size in carat (weight), (iii) diameter in mm, (iv) price/carat in DM & (v) price/stone (total price) in DM |
![]() ![]() |
Ebmeyer, H.W. | |||
Model | Type | Comments | Thumbnail |
Tarema | Slide Adder | TaReMa model name = TaschenRechenMaschine or pocket calculating machine |
![]() ![]() |
ECOBRA (Bayerische Reisszeugfabrik) | |||
Model | Type | Comments | Thumbnail |
(NoName) | Pocket Cabling | Special commission for Glasfaser M.B.H., Dusseldorf - company NAW on back |
![]() ![]() |
1461 | Pocket Rietz | ![]() ![]() | |
R141 | Pocket Rietz | OEM model by FUJI |
![]() ![]() |
R154 COSMOS | Technical/Log-Log | OEM model by FUJI + green rubber feet |
![]() ![]() |
Educational Novelty Co. | |||
Model | Type | Comments | Thumbnail |
"Consul" The Educated Monkey | Child's Teaching Aid/Calculator for simple arithmetic | Invented & patented (US1188490) by William Robertson in 1916 - “Consul” = name of famous performing monkey of the day - set x & ÷ problems with feet - results framed by monkey’s hands (+ & - problems need Addition Table card) |
![]() ![]() |
Engineering Instruments Inc. | |||
Model | Type | Comments | Thumbnail |
(10-B) | Book with Enhanced Mannheim without Trig scales | Cadillac Publishing Co. with give-away unmarked “10-B” with vol.1 of their Self-Teaching Encyclopaedia |
![]() ![]() |
10-B (unmarked) | Enhanced Mannheim | Conversion Tables on back |
|
10-B (unmarked) | Enhanced Mannheim without Trig scales - monochrome | Conversion Tables on back |
|
10-BK | Enhanced Mannheim without Trig scales | Standard Lawrence 10-B but called 10-BK with conversion tables on back | |
250-BT | Enhanced Mannheim | Conversion Tables on back |
|
250-BT | Enhanced Mannheim - early | Conversion Tables on back |
![]() ![]() |
250-BT | WINSCO Enhanced Mannheim | WINSCO Wabash Instruments & Specialities Inc. on back + - Tables of Constants |
|
250-V (ver. 1) | Enhanced Mannheim | Conversion tables on back |
![]() ![]() |
250-V (ver. 2) | Enhanced Mannheim | Identical to ver. 1 but promoted in different colour box + Conversion Tables on back |
|
5-B | Pocket Enhanced Mannheim without Trig scales | Unmarked “5-B” |
![]() ![]() |
5-B Learner | Pocket Student Enhanced Mannheim without Trig scales | Specially commissioned by Lakeside Toys + DRAFT-A-PLAN BY LAKESIDE printed on rule |
|
77A American | Log-Log | OEM rule made by American maker ACU-Math (model 150) - unusual layout means the back is often mistaken for the front |
![]() ![]() |
Draft-a-Plan kit (5-B) | LAKESIDE boxed set | OEM collaboration between Lakeside & Engineering Instruments |
![]() ![]() |
Engineering Mfg. Co. | |||
Model | Type | Comments | Thumbnail |
Calc-Slide | Enhanced Mannheim without Trig scales | strange raised wings of the cursor design |
![]() ![]() |
EURATOM | |||
Model | Type | Comments | Thumbnail |
Brinck - De Wolde | Geochemical | Complex rule invented by Dutchman Herman de Wolde & based on field work by Dutchman Johan Brink for calculating the probable of presence of metal deposits world-wide - 1 of only 5 ever made |
![]() ![]() |
Fang Yuan | |||
Model | Type | Comments | Thumbnail |
212 | Pocket Enhanced Mannheim | Missing “square circle” logo + metal backing plate & 1 cursor window with + 1 hairline in back |
![]() ![]() |
Farmar, F.C. | |||
Model | Type | Comments | Thumbnail |
Publicans' Rule | Standard for Licensed Victuallers | No. 1075 with early Liverpool address for helping publicans/innkeepers calculate over/under proof alcohol, gauging, blending, stocktaking, discount and profit + altimeter top-edge cm scale for height of liquid in a standing bottle + special C scale when used with either D, E, or F = amount of liquid in a barrel + G & H scales & reducing scale = amount of water to add to reduce alcohol strength (proof) or amount of spirits to add to raise alcohol strength + I & J scales give value of spirits if alcohol strength is raised or lowered + I & K scales = profits or discounts on sales/cost |
![]() ![]() |
Wine & Spirit Merchants Rule | Desktop Standard for Wine & Spirit Trade | Trade rule calculating over/under proof alcohol, gauging, blending, stocktaking, discount & profit + later Gloucester Terrace address = possibly made by Lucas |
![]() ![]() |
Farrow (James) | |||
Model | Type | Comments | Thumbnail |
The EASY Slide Rule | Artillery Range Finding | Designed and patented (GB117318) by Capt. Albert Charles Chew, British Royal Artillery |
![]() ![]() |
Fearns Calculators | |||
Model | Type | Comments | Thumbnail |
A13 Circular Slide Rule | Log-log | LL scale to base 10 - tables of conversion factors on back |
![]() ![]() |
A14 Circular Slide Rule / Conversion Calculator | Log-log Conversion | Front identical to model A13 but in separate part of wallet interchangeable extra outer disc with different conversion scales |
![]() ![]() |
Farmer's Weekly Metric Converter | Conversion | Farmer’s Weekly is a magazine started 75 years ago for farmers & agricultural businesses & is still being published weekly - conversion C & D scales double-up for simple multiplication, etc - extra conversion tables on both sides | ![]() ![]() |
Fenwick Dew Point & Relative Humidity Calculator | Whirling or aspiratted hygrometer humidity | Special commission for Fenwick Inspection Services Ltd., Southampton - 2 look-up windows in top disc | ![]() ![]() |
RS Stock No. 620-547 (A6) | Screw Thread Metric Converter | Special commission for Radiospares (RS), Australia - a company still operating |
![]() ![]() |
Fearns, Mear & Co. | |||
Model | Type | Comments | Thumbnail |
AUDCO Pipe Flow Calculator | Pipe Flow | Designed by Norman Mear for Auderly Engineering Co. Ltd (AUDCO) for calculating turbulent pipe flow of liquids & gasses + parts engraved by United Chemical Engraving Co. before assembled in-house & back used for calculating Reynolds No. |
![]() ![]() |
Festus Mfg. Co. / Acu-Rule Mfg. Co. | |||
Model | Type | Comments | Thumbnail |
Acu-Math 150 | Log-log | Unusual layout means the back is often seen as the front - identical to 150A except here end-braces added for extra rigidity & cursor is adjustable |
![]() ![]() |
Acu-Math 4 | Student Enhanced Mannheim without Trig scales | ||
Acu-Math 401 | Student Enhanced Mannheim | Having Trig scales on front face was supposed to make it easier to use - moulded cursor bought in from American Molding Co., St. Louis - cursor tension spring bought in from Midwest Spring Co., St Louis |
![]() ![]() |
Acu-Rule 10-D | Enhanced Mannheim without Trig scales | Often mistakenly thought to have been made by Lawrence - table of equivalents on back |
|
Acu-Rule G-W Photo | Photography | Specialist model (G-W = designers C.G. Goodchild & L.V. Whitney) for photographers for calculating a comprehensive set of photo-related of camera settings + retailers AREL Inc. sole distributors - table of ASA film speed indexes & photography tips on back |
![]() ![]() |
Acu-Rule MR700 Mu-Stick | Music Chord Finder & Key Transposer | Unlike any other Acu-Rule or music type - design copyright Mel McSwain - sole distributor: McSwain Co., Arkansas |
![]() ![]() |
Acu-Rule Van Nostrand | Enhanced Mannheim | OEM for retailer & publisher: D. Van Nostrand, New York - table of equivalents on back |
|
Acu-Rule Yoder 103 | Enhanced Mannheim | OEM for Yoder Instruments, Ohio (related company : Lafayette) - table of conversions on back |
|
Festus (100) | Enhanced Mannheim without Trig scales | Same stock as later Acu-Rule model 100 - table of equivalents on back - possibly transition model with paper (edges + back) & painted (front) scales |
![]() ![]() |
Flying Fish (Shanghai Slide Rule Factory) | |||
Model | Type | Comments | Thumbnail |
1002 (ver.2) | Electro Hyperbolic | Fawn end braces + unusual layout of scales |
![]() ![]() |
Fowler | |||
Model | Type | Comments | Thumbnail |
Junior (4MJRG1) | Pocket Concentric long-scale | Unusual serrated revolving discs & only non-watch type Fowler made + on both sides many gauge marks around outermost/peripheral ring |
![]() ![]() |
Long Scale Calculator (2MG2) | Pocket-Watch Concentric long-scale - early | Serial No. 14075 stamped in bulls eye on back - two milled winders - many gauge marks around outermost/peripheral ring on both sides |
![]() ![]() |
Magnum (4MG1) | Pocket-Watch Concentric long-scale | Two milled winders - many gauge marks around outermost/peripheral ring - plain black back |
![]() ![]() |
Twelve-Ten (3MG2) | Pocket-Watch Business - early | Serial no. 330 with Bakelite back is 1st of 3 model variants + model name derived from C scale divided into tenths & 2 x D scales divided into twelves to help with decimal & duodecimal calculations - various gauge marks around outer rim |
![]() ![]() |
Type B (3MT1) | Pocket-Watch Textile - early | Two milled winders (one missing crown ring) - many textile-based gauge marks around outermost/peripheral ring - plain chrome back |
![]() ![]() |
Type E1 (2CTb2) | Pocket-Watch Textile | Serial No. 4404 - two milled winders (one with crown ring) - many textile-based gauge marks around outermost/peripheral ring - table of weaving-related factors on back |
![]() ![]() |
Type T (2AT1) | Pocket-Watch Scientific Publishing Textile | Early pre Fowler + prominent axle & two (1 ringed) crown winders & replaced by Fowler's Type M - tables on back |
![]() ![]() |
Fuji Keiki Mfg. Co. Ltd. | |||
Model | Type | Comments | Thumbnail |
106 | Technical two-tone | ![]() ![]() | |
1200 01 (ver. 2) | Darmstadt-like two-tone | 4 plastic/rubber feet on back |
![]() ![]() |
125 B | Technical two tone | Appears strangely identical to model 106 except Fuji name is in italics & back braces are coloured green |
![]() ![]() |
1250 S (ver. 2) | Log-Log two-tone | 4 plastic/rubber feet on back |
![]() ![]() |
535 S | Pocket Enhanced Mannheim two-tone without Trig scales | ||
F-100 | Technical two-tone | ![]() ![]() | |
Gamma | |||
Model | Type | Comments | Thumbnail |
2503 | Budapest Darmstadt | Company founded in Hungary in 1920 but may have started with OEM rules from UK maker A.G. Thornton as the style of the pi & telltale 8-pointed star marks on the box with Gamma name & logo suggests it is an early Thornton/PIC-made rule. |
![]() ![]() |
Gebr. Wichmann | |||
Model | Type | Comments | Thumbnail |
1418 R III | Rietz | OEM by Nestler - cm scale in well - table of constants on back + 2 cursor windows |
|
1425 | Enhanced Mannheim | OEM by Nestler - cm scale in well - table of constants on back + 2 cursor windows |
|
1427 | Rietz | OEM by Dennert & Pape - D&P + DRP No. 126499 in well of stock + conversion tables on back + 1 cursor window |
|
1919R | Desktop Rietz | OEM by Nestler - cm scale in well of stock + hand-written list of formulas on back |
|
431 | Mannheim | Model from the earliest known series - table of conversion factors on back |
![]() ![]() |
4429 | School Rietz | OEM by Faber-Castell with cm & inch scales on back + 2 cursor windows |
|
4430 | Pocket Enhanced Mannheim | OEM version made by Dennert & Pape + cm & reversed inch scale on back + 2 cursor windows |
|
4477 | Darmstadt | OEM by Faber-Castell with cm scale in well + 2 cursor windows in back |
|
Drieskalen | Rietz | OEM by Nestler - table of constants on back + 2 cursor windows |
|
QR 41 | Desktop Military Artillery Squaring | OEM by Dennert & Pape + QR = Quadrat-Rechenschieber & 41 = year of production - commissioned by “Gebr. Wichmann” (stamp in well) - probably classroom training aid for anti-aircraft gunners as it was specially designed for solving Pythagorean triangles + layout consists of two pairs (upper set 0 - 50 & lower set 0 - 15.8) of non-logarithmic independent root scales (no interaction) derived from a set of tables by German Peter Timpenfeld & first published in 1888 - non-conventional use of a cursor purely for positional summing of the squared values |
![]() ![]() |
Geo. W. Richardson | |||
Model | Type | Comments | Thumbnail |
1776 | Direct Reading Polymetric Rietz | Keyholes (top left & bottom right) are direct reading line-up points for a table of codes on the back. By aligning a chosen code in the keyhole the slide is automatically set for the chosen calculation. Provisional patent no. 1-31-11 on slide - full patents = 1911 US982876 & in 1912 US1021484 . |
![]() ![]() |
Direct Reading | Enhanced Mannheim | Keyholes (top left & bottom right) are direct reading line-up points for a table of codes on the back. By aligning a chosen code in the keyhole the slide is automatically set for the chosen calculation. Provisional patent no. 3-26-12 on cursor - full patents = 1911 US982876 & in 1912 US1021484 . |
![]() ![]() |
Slide Rule Model of 1917 | Desktop Artillery Range Finding | Robust military grade OEM for J. H. Weil & Co. - Trig scales are in Mils (6400 mils = 360 degrees) |
![]() ![]() |
George Philip & Son Ltd. | |||
Model | Type | Comments | Thumbnail |
Planisphere | Astronomy - Northern Hemisphere | Slide chart to calculate star positions & star signs at latitude 52½º North for given date & time |
![]() ![]() |
GILL, Thomas & Co. | |||
Model | Type | Comments | Thumbnail |
Sikes' 6755 | 2-rule Alcohol Hydrometer set - temperature correcting | Layout on back of Proof rule merely extends range from front + 2nd Comparative rule is for calculating temperature corrections + hydrometer scale runs from 0-10 range + partial set of 8 brass weights (10 - 90 but 30 missing + cap) all stamped: 6755 but 2 from Dring & Fage + thermometer by Dring & Fage |
![]() ![]() |
Goliardo | |||
Model | Type | Comments | Thumbnail |
(NoName) | Pocket Mannheim | Little known Italian maker/reseller |
![]() ![]() |
Gordon, A.M. | |||
Model | Type | Comments | Thumbnail |
Scale of Power & Speed | Ship design/construction | One of a set of 4 such rules designed by Glaswegian Alexander Milne Gordon (1870’s-1922) M.I.N.A. |
![]() ![]() |
Graphic Calculator Co. | |||
Model | Type | Comments | Thumbnail |
Foxboro Vortex Flowmeter Sizing Guide | Pipe Flow (steam & gas) | Specially commissioned slide chart but with slide rule operations & cursor - front for steam - back for gas - table on front | ![]() ![]() |
Graphoplex | |||
Model | Type | Comments | Thumbnail |
(NoName) 615 | Pocket Rietz - early | Early because lacking model no. + red outline of logo - longer than usual for pocket - two open windows with cursor line in back |
![]() ![]() |
(NoName) 620 | Rietz - early | Early because milky white original plastic + lacking model no. + red outline of logo - two closed windows with cursor line in back + table of constants om back |
![]() ![]() |
1600 | School Rietz C.A.P. | ![]() ![]() | |
1600 | School Rietz C.A.P. - blue bands | Grey plastic case denotes a later model - “easy reading” blue banding for A/B & C/D scales |
![]() ![]() |
1612 | Pocket Rietz - early & all black | one open window right with 1 hairline in back - black logo = early model |
![]() ![]() |
1614 | Demonstration School Log-Log | Does not have cm top edge scale on standard 25cm 1614 |
![]() ![]() |
1614 | School Log-Log C.A.P. | ![]() ![]() | |
1694 | Technical | ![]() ![]() | |
16oo | School Riez C.A.P. - early & all black | Note mixed alphanumeric 16oo model no. - layout different to standard/later 1600 Rietz - black logo = early model |
![]() ![]() |
604 | Typography Cicero printing | Ruler with cursor conversion aid + Cicero (old French thumb unit of measure = 27.07mm) is a typographic unit similar to a pica but with 15th century origins |
![]() ![]() |
612 | Pocket Rietz | one open window right with 1 hairline in back |
![]() ![]() |
615 | Pocket Rietz | Slightly longer than the 612 - one open window right with 1 hairline in back |
![]() ![]() |
620 (ver. 5) | Rietz | One closed window right with 1 hairline in back |
![]() ![]() |
620 d (ver. 1) | Rietz | Model no. on back of slide - one open window with cursor line in back on right |
![]() ![]() |
6245 | Desktop Electro Log-Log | Two closed windows with cursor line in back + see also smaller 643 sibling |
![]() ![]() |
6250 | Desktop Rietz | Late model as colours have sweated or bleed because cheaper methyl ethyl replaced phenol as etching agent - two closed windows with cursor line in back |
![]() ![]() |
630 | Geometre Stadia Topography - 400g early | Missing model no. - table of conversion factor on back + one open window with cursor line in back on right |
![]() ![]() |
640 | Electro Log-Log | One open window with 1 hairline in back |
![]() ![]() |
643 | Pocket Electro Log-Log | Name of NL company Ingersoll-Rand in well of stock - one open window right with 1 hairline in back = see also larger 6245 sibling |
![]() ![]() |
647 | Darmstadt | Unusual inclusion of AI scale |
![]() ![]() |
650 | Pocket Electro | § scales = 2-part COS scale - unusually for Electro’s W & V scales on front face |
![]() ![]() |
680 STATOS | Reinforced Concrete - System Lüthy/Nussbaum | Patented design (CH314378) by Peter Lüthy & Max Nussbaum - § scales for N = 10 - Co. name MONTEFERNO, Bodio (CH) in well & on back - table of constants on back |
![]() ![]() |
681 STATOS | Pocket Reinforced Concrete - System Lüthy/Nussbaum | Patented design (CH314378) by Peter Lüthy & Max Nussbaum - § scales for N = 10 - Co. name MONTEFERNO, Bodio (CH) & table of constants on back |
![]() ![]() |
690 (ver. 2) | Neperlog Log-Log | Impressive layout of 25 scales - Neper or Np is a logarithmic unit of measurement of physical field & power quantities + see comparable sibling model 690 a |
![]() ![]() |
690 a | Neperlog Log-Log | Impressive layout of 26 scales - Neper or Np is a logarithmic unit of measurement of physical field & power quantities -+ see comparable sibling model 690 - comparable to ARISTO 0968 |
![]() ![]() |
694 a | Technical/Log-Log | ![]() ![]() | |
CALTEX | Petroleum Rietz | Same model rebadged for TEXACO & CALCRUDE - red outline of logo = early - bizarre cursor design - °F & °C scales in well of stock - back of slide has American Petroleum Institute (API) crude oil gravity scales - table of constants + CALTEX logo on back |
![]() ![]() |
DYNSTAT | Desktop Impact Testing | DYNSTAT is a mechanical impact/resilience testing method popular in Germany (DIN 53435) for testing small samples of plastic |
![]() ![]() |
EDF 355.145 | Electrical Power Cables | EDF = Electricitè de France - identical to model EDF 35 11 408 - table of values for single-phase lines in well of stock - table of maximum permissible intensity values on back |
![]() ![]() |
FLEXIMAX | Steel Beams - System Potzsch/Demulder/Gajac | For calculating steel beams according size, weight, profile, etc based on formulae from Potzsch/Demulder/Gajac + two full-width open windows with cursor lines in back |
![]() ![]() |
Gaz de France 65-TX-01 | Pocket Gas Pressure/Flow in Pipes & Ducts | ![]() ![]() | |
KOH-I-NOOR 10020 | Technical | Part of series for Czech stationer KOH-I-NOOR - copy of model 1694 |
![]() ![]() |
Meteo No. 2 | Meteorology - early & all black | Simpler version of two Meteo models for weather forecasting - distance scales in both imperial & metric - black logo = early model |
![]() ![]() |
Panneau Publicitae | Demonstration/Display Log-Log | 100% dummy - scale layout printed on sheet of plastic as shop window advertising item - also made half-size version |
![]() ![]() |
REVACO | Hydralic/Pipes/Valves flow rates | Made for CONTROLEXACT (later version II for COMSIP AUTOMATION) - for calculating flow (liquid & gas) in valves & flowmeters - REVACO = registered trademark - unusual layout/design & striking cursor |
![]() ![]() |
REVACO II | Hydralic/Pipes/Valves flow rates | Made for COMSIP AUTOMATION (original version for CONTROLEXACT) - for calculating flow (liquid & gas) in valves & flowmeters - REVACO = registered trademark - unusual layout/design & striking cursor |
![]() ![]() |
ROPLEX | Rietz | Designed for rapid & accurate calculating - circular but housed in square case - front & back shown as per instructions - slide also worked by metal wheel - table of gauge points in centre |
![]() ![]() |
SHELL (ver. F) | Pocket Heating Oil Central Heating Efficiency | Uniquely slide is part of closed frame (no cursor) on back of stock - registered design commissioned by Shell Nederland Verkoopmaatschappij (SNV) for Heating Oil Inspectors to calculate efficiency levels (CO2, temperature & soot content) from exhaust gasses in the flue - read more ... |
![]() ![]() |
SHELL (ver. NL) | Pocket Heating Oil Central Heating Efficiency | Uniquely slide is part of closed frame (no cursor) on back of stock - registered design commissioned by Shell Nederland Verkoopmaatschappij (SNV) for Heating Oil Inspectors to calculate efficiency levels (CO2, temperature & soot content) from exhaust gasses in the flue - read more ... |
![]() ![]() |
SHELL-MEX/BP | Pocklet Heating Oil Stack-Loss | Shell-Mex & BP logo’s on back + one open window with 1 hairline in back + follow-on from earlier Central Heating Efficiency model made for Shell in NL (SNV) - read more ... |
![]() ![]() |
THERMOCOAX | Metrology Electro | Top 3 scales are constants for Chromel, Iron & Chromel/Alumel - bottom 4 scales are for Chromel/Alumel (but smaller range) & Platinum/Rhodium (3 different %‘s) - scales on front of slide are for 2 different voltages of electrical couplings - inch scale on back |
![]() ![]() |
Griffin & Co. Ltd. (Charles) | |||
Model | Type | Comments | Thumbnail |
Horse Power Computer for Steam Engines | Speed poly-disc (3) | Unlike similar calculators Golding's patented design (GB190708196) took into account 7 variables when calculating HP of a steam engine - read more … |
![]() ![]() |
Grove, W. | |||
Model | Type | Comments | Thumbnail |
(NoName) | Alcohol Gauging poly-slide(2) | Post 1824 imperial based units/gauge marks + front face bottom slide can be slotted in alongside top slide (hence it only runs to 9.5) for double length i.e. Everard-like + considered by fellow collector David Riches Missing Link between square Everard design & follow-on duplex models - read more ... |
![]() ![]() |
Halden (Joseph) | |||
Model | Type | Comments | Thumbnail |
Calculex -1795A | Watch Eugene Dieztgen - Type 2 | Yellow rear cursor glass stamped with the no. 45 suggests this model was retailed by Eugene Dieztgen |
![]() ![]() |
Dafield | Monetary | Made by John Davis & Son - Patent No. GB227643 in well |
![]() ![]() |
Heath & Co. | |||
Model | Type | Comments | Thumbnail |
Hezzanith | Twaddell Hydrometer | Refrigerant brine strength tester used on ships or in cold stores + scale runs from 35 to 50 for 60º F - see also slide rule calibrated in Twaddell’s |
|
Hezzanith | Enhanced Mannheim | Inch (32nds) & cm (mm) scales in well of stock - conversion tables on back |
![]() ![]() |
Hezzanith Carmody | Celestial Navigation/Log-Log | Probably designed by Dr. Carbody but OEM (P1572) from Blundell Harling (box + insert & patented adjustment screws) - cm scale on back + unique table of half-versine or haversines - the table is vital when the distance between two points is < 400km |
![]() ![]() |
Hezzanith Le Patourel | Celestial Navigation/Mannheim | Probably Thornton-made (similar to PIC 3654) - reduction scale (not Haversines) by Captain Charles Le Patourel in well of stock for correcting degrees above horizon when a star transcends its meridian - Le Patourel compiled tables of nautical data also on back |
![]() ![]() |
Hemmi | |||
Model | Type | Comments | Thumbnail |
1 | Enhanced Mannheim | Branded on front but no discernable model no. but part of obsolete 1-18 range of model no.'s abandoned circa 1930 + cm scale in well of stock + metal backing plate & paper table of conversion factors/scale on bac |
![]() ![]() |
1/1 | Enhanced Mannheim | Part of obsolete 1-18 range of model no.'s abandoned circa 1930 + metal backing plate & paper table of conversion factors/scale on back |
![]() ![]() |
101A | Demonstration Enhanced Mannheim | Classroom version for models 40RK & 43A - Sun was added later as company logo |
![]() ![]() |
130 | Darmstadt | Branded in well but no discernable model no. + unusually extra S,T scales on the bottom side edge + metal backing plate & plastic table of conversion factors on back |
|
135 | Pocket Darmstadt | metal backing plate |
|
136 | Pocket Darmstadt | unusually extra S,T scales on the bottom side edge + metal backing plate & plastic table of conversion factors on back |
![]() ![]() |
149A | Pocket Log-Log | branding on back of stock + A model no. suffix = additional catalogue/bookkeeping listing but otherwise no change to 149 |
![]() ![]() |
255D | Electro Hyperbolic | For Electrical Engineering + D model no. suffix = with DI scale but otherwise replaced 155 + metal end braces |
![]() ![]() |
257L | Chemical | model name suffix L probably refers to the LM scale for calculating Logarithmic Mean Temperature that replaced the F(t) scale found on the original 257 + special gauge marks for determining atomic & molecular weights |
![]() ![]() |
259D | Log-Log | branding on back of stock + metal end braces + D model no. suffix = with DI scale but otherwise identical to 259 |
![]() ![]() |
260 | Log-Log | metal end braces + WULFF & UNIVERSITY with branding stamped into both side edge |
![]() ![]() |
2640 | Enhanced Mannheim | Reissued version of model 50W for post 1940 2600 series with the K scale unusually delegated to back of slide + metal backing plate & plastic table of conversion factors on back |
![]() ![]() |
2664S | Technical | Cobranded with Masoneilan + S model no. suffix possibly = 2664 with supplementary green coloured CIF scale + metal backing plate & plastic table of conversion factors on back |
![]() ![]() |
2690 | Stadia Topography - 360 | metal backing plate & plastic table of conversion factors on back |
![]() ![]() |
275 | Desktop Electro Hyperbolic (ver. 1) | Desktop version of 25cm model 255 - § scales on front face for converting degrees into radians & vice-versa - supposedly for Advanced Electrical Engineers. |
![]() ![]() |
279 | Desktop Expert Mechanical Engineer | metal end braces - desktop version of 259 |
![]() ![]() |
30 | Lilliput Enhanced Mannheim | Promotional model for Swedish company + metal backing plate |
|
30 | Lilliput Enhanced Mannheim - late | Metal backing plate |
|
301 | Control Engineering | Design invented by Prof. Keisuke Izawa of Tokyo Institute of Technology for frequency responses of physical systems where transfer functions can be linear & exponential + extremely complicated to use with multiple cursors + metal backing plate + see also advanced sibling 301A |
![]() ![]() |
301A | Control Engineering | Designed by Prof. Keisuke Izawa of Tokyo Institute of Technology for frequency responses of physical systems where transfer functions can be linear & exponential + overlay co-developed with Tomoaki Morinaga especially for quadratic factor + extremely complicated to use with multiple cursors/overlay + metal backing plate + see also “basic” sibling 301 |
![]() ![]() |
32 | Lilliput Enhanced Mannheim | Identical to model 30 but given model no. 32 because of magnifying cursor + red logo on right-hand end of slide = retailer's trademark + metal backing plate |
![]() ![]() |
32R (POST 1441) | Lilliput Enhanced Mannheim | Model no. suffix R = with reciprocal CI scale (suffix later dropped) + co-branded on back POST 1441 + metal backing plate |
![]() ![]() |
34 | Pocket Mannheim | metal backing plate stamped with “G. DIKKES & Co N.V.” |
|
34P | Pocket Mannheim | significance of the P model no suffix not known + metal backing plate stamped with “BYGGNADS AB JOHAN GUSTAFON & SONER” |
![]() ![]() |
34R | Pocket Enhanced Mannheim | branded on front but no discernable model no. + R model no. suffix = basic 34 with reciprocal CI scale + metal backing plate |
|
34RK | Pocket Rietz-like | RK model no. suffix = basic 34 with reciprocal CI & K scale + metal backing plate |
|
34T | Pocket Enhanced Mannheim | T model no. suffix possibly = basic 34 with Trig scales + metal backing plate stamped with “SUN” |
|
34T | Pocket Enhanced Mannheim - late | T model no. suffix possibly = basic 34 with Trig scales + plain (no SUN or ASEA stamping) metal backing plate |
|
35 | Lilliput Enhanced Mannheim | metal backing plate stamped BOFORS |
![]() ![]() |
40 | Enhanced Mannheim | branded on front face but no discernable model no. + metal backing plate & plastic table of conversion factors on back |
|
40RK | Rietz-like | RK model no. suffix = basic 40 with reciprocal CI & K scale + metal backing plate |
|
50 | Enhanced Mannheim | same as 4x models but with an extra CI scale + metal backing plate |
|
64/3 | Rietz | /3 model no. suffix = 3-line cursor + later siblings |
|
64T | Rietz | considered extended version of the basic Rietz 64 because of additional scales + T model no. suffix possibly = basic 64 with extra Trig scales + later broader 642T sibling + metal backing plate & plastic table of conversion factors on back |
![]() ![]() |
70 | Desktop Improved Rietz | Branded in well but no discernable model no. + table of conversion factors on back - also sold as Tamaya 4480 |
![]() ![]() |
74 | Pocket Rietz | branding on back of stock + metal backing plate |
|
80/1 | Electro - imperial | branded in well but no discernable model no. + W,V scales in well + /1 model no. suffix = 1-line cursor + metal backing plate |
![]() ![]() |
80/3 | Electro - metric | branded in well but no discernable model no. + W,V scales in well + /3 model no. suffix = 3-line cursor + metal backing plate & plastic table of conversion factors on back |
![]() ![]() |
86/3 | Pocket Electro | branded in well but no discernable model no. + W,V scales in well + /3 model no. suffix = 3-line cursor + metal backing plate & plastic table of conversion factors on back |
![]() ![]() |
Baseball | Pocket Sport | Probably a promotional give away for a professional baseball team but model is listed in Hemmi Catalogue 6911 + example calculations in instructions use baseball data from 1965 season |
![]() ![]() |
Foxboro | Pipe Flow & Valve Sizing - metric | Maker's branding only stamped into cursor + 3rd party dual branding with econosto n.v. + green end braces & Reynolds No. on back + |
![]() ![]() |
P24 | Student Technical | P model no. prefix = plastic + green coloured end braces |
![]() ![]() |
P253 Vectolog | Log-Log | Plastic version of 264 marketed with an "Arrow Feather Shape" for easy/smooth operation + grey end braces on back |
![]() ![]() |
P261 | Log-Log | Green end braces & cursor trim |
![]() ![]() |
P280 | Darmstadt-like two-tone | ||
P281 | Rietz-like two-tone | ||
P40RK | Enhanced Mannheim | Dark-grey end braces with cursor windows |
|
P45K | Technical | P model no. prefix = plastic & K model no. suffix = addition of K scale to basic 45 but other than being open-frame, identical to 45K + green coloured end braces |
![]() ![]() |
P45S | Technical | All plastic version of 45K + /S model no. suffix = simplified version of P45K |
![]() ![]() |
Hexadaisy Products | |||
Model | Type | Comments | Thumbnail |
HEXADAISY Hexadecimal Calculator | Arithmetic/Conversion for computer programmers | Slide chart for adding, subtracting & converting between decimal & hexadecimal with copyright A695383 held by Erich A. Pfeiffer + two tables – probably called & trademarked “HEXADAISY” because it looks like a member of the aster family of flowering plants - read more … |
![]() ![]() |
HEXCO Inc. | |||
Model | Type | Comments | Thumbnail |
HEX adder | Hexadecimal slide adder for computer programmers | Registered design - company started by ex-IBM system engineers Tom & Linda Tarrant - catchy company slogan: “IBM 360 Programmers without 16 fingers ?” - read more ... |
![]() ![]() |
Hicks J.J. | |||
Model | Type | Comments | Thumbnail |
Pilot Balloon Mark I | Desktop Meteorology poly-slide (2) | Meteorological Office (MO) No. 676/38 - innovatively two slides can be locked together & act as one or when unlocked, move independently BUT even when unlocked, if top slide is moved it takes bottom one with it. |
![]() ![]() |
Hoehler A. A. (HH) | |||
Model | Type | Comments | Thumbnail |
Universum | Rietz | HH = firm A.A. Hoehler aus Hohen Neuendorf - rare model from former GDR with uncommon scale length - table of conversion factors on back + 2 cursor windows |
![]() ![]() |
HONO | |||
Model | Type | Comments | Thumbnail |
300 No. 1 | Rietz-like | All scales on front face - FAé-LuM on back refers = Force Aérienne–Luchtmacht i.e. OEM model for Belgium Air Force (source: Ronald van Riet) - HSB on back possibly company logo |
![]() ![]() |
Hope Slide Rule Mfg. Co. | |||
Model | Type | Comments | Thumbnail |
51 | Enhanced Mannheim | Made same model for Hemmi ( P3526) but mainly retailer to Japanese OEM's like Fuij, Kutsuwa, etc |
|
Inglis | |||
Model | Type | Comments | Thumbnail |
Flash | Bank Interest poly-slide (4) calculator | Hybrid ready reckoner/tabular calculator for calculating bank interest due on deposits, discounting bills or prepayment of calls for amounts between GBP 10 to GBP 1000 - read more ... |
![]() ![]() |
Flash | Pocket Engineer's poly-slide (2) calculator | Hybrid ready reckoner/tabular calculator for machinery & other engineering related conversions & problems - read more ... |
![]() ![]() |
Flash | Square and Cubic poly-slide (4) calculator | Hybrid ready reckoner/tabular calculator for calculating square areas & cubic volumes - left-hand page of scales for calculating (imperial only) in feet and inches up to 20 sq. feet & 100 cubic feet - right-hand page of scales is for calculating (imperial & metric) in yards, feet or inches up to 100 sq. yards & 100.000 cubic yards - read more ... |
![]() ![]() |
Flash | Universal poly-slide (4) calculator | Hybrid ready reckoner/tabular calcuator for a wide variety of calculations including imperial based units - read more ... |
![]() ![]() |
ITAB (Internationaler Tabellenverlag) | |||
Model | Type | Comments | Thumbnail |
Kalksandstein-Rechner | Pocket Sand-lime House Bricks | For calculating required thermal insulation when building a house with sand-lime bricks - unique patented (DE1774408) magnetised slide - slide not reversible but scale used only in conjunction with cursor window in back |
![]() ![]() |
Linde-Gasrechner | Pocket Chemical / Gas Conversion | Specially commissioned by German Linde A.G. gas company for calculating relationship between Litres, Kg & M3 for the chemical composition of various gasses - unique patented (DE1774408) magnetised slide - slide not reversible but scale used only in conjunction with cursor window in back |
![]() ![]() |
IWA (Ingenieurbuero fuer wirtschaftliches Arbeiten) | |||
Model | Type | Comments | Thumbnail |
14127 Haffmans | Beer Brewing | Specially commissioned by Dutch quality control equipment supplier Haffmans for brewing & related industries + © design for calculating CO2 % in beer by weight using formula devised by Dutchman J. van Strien when working for Dutch brewer Heineken + later sibling 14162 version for calculating CO2 by volume - part of pharmaceutical, chemical, physical & medical purposes series |
![]() ![]() |
14162 Haffmans | Beer Brewing | Specially commissioned by Dutch quality control equipment supplier Haffmans for brewing & related industries + © design for calculating CO2 in beer by volume using formula devised by Dutchman J. van Strien when working for Dutch brewer Heineken + earlier sibling 14127 version for calculating CO2 by weight - part of pharmaceutical, chemical, physical & medical purposes series |
![]() ![]() |
14350 ECG | Cardiology | Ruler to help cardiologists analyse printed electrocardiographs (ECG’s) traces from electrocardiogram machines for standard paper speeds of 25 or 50 mm/s - part of pharmaceutical, chemical, physical & medical purposes series |
![]() ![]() |
15379 (TF 65/2) | Music Piano & Harpsichord Builders | Specially commissioned (2500 made) & exclusively sold by German music retailer Verlag Erwin Bochinsky (trading name Verlag Das Musikinstrument) + based on earlier prototype by German master piano builder Klaus Fenner for wound & unwound strings + calibrated for imperial & metric sizes + table on back for recalibrating steel core wound strings - part of sundry applications series |
![]() ![]() |
15512 Cocktailwähler | Lilliput Mixology | Slide chart in © credit card format for mixing 22 different cocktails + with half no. of cocktails but uncannily similar to BH version - part of sundry applications series |
![]() ![]() |
J. A. Nicholl & Co. | |||
Model | Type | Comments | Thumbnail |
Mark VI | Desktop Artillery for Indirect Fire | Serial no. = 48 - called Apparatus for the Observation of Fire was intended for use by lance-corporals & corporals in the field & not on a desk - issued by Min. of Defence |
![]() ![]() |
J.H. Steward Ltd. | |||
Model | Type | Comments | Thumbnail |
(NoName) | Pocket Joint Round-hinged English Sector | Used with a set of dividers - OEM made (possibly by Jacob & Halse/Abraham group) but pre 1913 when Steward became a Ltd. - read more ... |
![]() ![]() |
(NoName) | Pocket Rectangular Protractor/Diagonal Scale - imperial | 0-360 degree model OEM made but pre 1913 when Steward became a Ltd. - read more ... |
![]() ![]() |
B1243 Mcleod | Lilliput Military Artillery Gunnery | Mini gunnery rule for Field Artillery Officers designed by Lieutenant-Colonel N.M. McLeod with folded scales - slide not reversible but one open window in back |
![]() ![]() |
J184 | Enhanced Mannheim | OEM by D&P (model I) - cm scale & DRP 126499 in well + 2 cursor windows in back & 3 adjusting screws in bottom side edge - A.G.N. WYATT. on front face suggests a special commission for Rear-Admiral Arthur Guy Norris Wyatt who joined the RN Surveying Service in 1918 |
![]() ![]() |
Motor Transport | Pocket Military Vehicle Logistics & Supply | OEM made but post 1913 when Steward became a Ltd. - earlier version known as Vee Tee Meter - VEH = no. of vehicles - V.T.M. = Vehicles To the Mile - M.I.H. = Miles In an Hour or mph - read more ... |
![]() ![]() |
Jackson Brothers Ltd. | |||
Model | Type | Comments | Thumbnail |
(NoName) | Mannheim | Little known maker from Leeds, UK |
![]() ![]() |
Jakar | |||
Model | Type | Comments | Thumbnail |
(NoName) | Rietz-like two-tone | OEM by FUJI but unusually for Rietz type all scales on front face |
|
22 | Pocket Darmstadt-like two-tone | OEM by FUJI |
![]() ![]() |
33 | Pocket Log-Log two-tone | OEM by FUJI |
![]() ![]() |
532A | Pocket Rietz two-tone | OEM by FUJ |
![]() ![]() |
99 | Log-Log two-tone | OEM by FUJ but without rubber feet |
![]() ![]() |
Johann Faber | |||
Model | Type | Comments | Thumbnail |
9205 (SYSTEM RIETZ) | Rietz | OEM version made by KHH (5 slits in well + 5 adjustment screws on bottom side edge) + conversion tables & 2 cursor windows in back |
![]() ![]() |
9206 (ELECTRO 15) | Electro | OEM version made by KHH (5 slits in well + 5 adjustment screws on bottom side edge) but often mistaken as D&P because of model no. - V & W scales in well of stock + conversion tables (in NL) & 2 cursor windows in back - see also identical model sold by Ahrend, OHICO & Kahn Frères |
![]() ![]() |
John Davis & Son (Derby) Ltd | |||
Model | Type | Comments | Thumbnail |
(NoName) | Student Mannheim | Made by Dennert & Pape: no steel back, 4 horizontal slits in well of stock, veneers fixed by 6 screws, early D&P pi gauge mark - double bevelled edge model + paper scale for conversion factors on back |
|
Autocrat | Mannheim with Trig scales | “British Made” - steel back + paper table of conversion factors |
|
Celluloid | Mannheim with Trig scales | OEM by Dennert & Pape: no steel back, early D&P pi gauge mark + extension of inch scale (10-20) in well of stock + 06 & D.R.P. No 126439 stamped in well of stock |
|
Celluloid | Mannheim with Trig scales - early | OEM by Dennert & Pape: no steel back, 4 horizontal slits in well of stock, no pi gauge mark - railway track scales + extension of inch scale (10-20) in well of stock + John Davis cardboard enclosure for conversion factors, etc |
|
Democrat | Desktop Mannheim with Trig scales | 15” version of Autocrat model with extension of cm scale (16-32) in well of stock. “British Made” - steel back + paper table of conversion factors |
|
Dubilier | Capacitance Electronic poly-slide (2) | OEM by A.G. Thornton but retailed by Davis + copyrighted design by Philip Ray Coursey whilst working for Dubilier Condenser Company - MADE IN ENGLAND in well of stock, JOHN DAVIS & SON Ltd printed on the back with two open cursor windows |
![]() ![]() |
Durocrat | Desktop Mannhiem | Unmarked - cm scale extension + 6 slits in well of stock - L scale reversed |
|
Glider | Rietz | Glider name comes from slide-long slotted metal patented (GB232037 - L.E. Edwards) tensioning spring for “automatic” smooth sliding - steel back + paper table of conversion factors |
![]() ![]() |
John Rabone & Sons | |||
Model | Type | Comments | Thumbnail |
(1206) Perfors | Pocket Calliper Rope / Bulb Gauge | No model number but appears to be specially commissioned modern version of 1206 for Dutch bulb grower J.H. Perfors for measuring bulb diameter & giving circumference alongside as bulbs commercially sold & graded by size |
![]() ![]() |
(1460) | Pocket Calliper Conversion Gauge | No model number but appears to be modern slimmed-down version of 1460 for converting between imperial & metric |
![]() ![]() |
(NoName) | Glovers Rule | Squared tapering rule with identical inch scale on each side for measuring length of a glove |
![]() ![]() |
1165 | Joint 4-fold Large Square-hinged Protractor Rule | Colloquially known as a “Blind Man's” rule because of the size & thickness of the numbering made it easy to see with poor eyesight or in low light |
![]() ![]() |
1206 | Pocket Calliper Rope Gauge | For measuring rope diameter & giving circumference alongside + rope (metal & fibre) weight tables on front & back as rope commercially sold by weight not length |
![]() ![]() |
1206 Oude Lijnbaan | Pocket Calliper Rope Gauge | Specially commissioned version for Dutch ropeworks De Oude Lijnbaan Ltd. for measuring rope diameter & giving circumference alongside + rope (manila & sisal) weight table on back as rope commercially sold by weight not length |
![]() ![]() |
1211 | Pocket Joint 4-fold Old Arched-hinged Calliper Rule | Calliper scale in 32nd’s of inch |
![]() ![]() |
1550 | Beer Dipping | Unmarked square rod but with Rabone "look & feel" |
|
Carpenter Timber No. 2379 | Pocket Joint 4-fold Old Arched-hinged Coggeshall | D Girt line = 4-40 + two-entry ½ to ¼ scale table & 12-18 “Pence per Load” table (split over 2 legs) on front |
![]() ![]() |
Carpenter Timber No. 2423 | Joint 2-fold Vulcan-hinged Coggeshall | D Girt line = 4-40 with Vulcan logo & design lozenge for 1869 + two-entry ¼ to ½ scale table on front + ¾-length E & M scales (split over 2 legs) on back |
![]() ![]() |
Jorgensen (Ole) | |||
Model | Type | Comments | Thumbnail |
7888 International Circle | Pencil Cup/Desk Tidy Time Converter | Red with two black & one red rotating ring - made in Hong Kong |
![]() ![]() |
Bulkoil | Pencil Cup/Desk Tidy Metric Converter | Black with two rotating rings - made in Denmark |
![]() ![]() |
CCW | Pencil Cup/Desk Tidy Basic | CCW = original Creative Workshop Inc. version - black with four grey metal rotating rings - made in Denmark |
![]() ![]() |
Control Data Universal Circle | Pencil Cup/Desk Tidy Basic | Black with two white & two grey rotating rings - made in Denmark |
![]() ![]() |
Kahn Frères | |||
Model | Type | Comments | Thumbnail |
Electro 15 | Electro | OEM version made for Brussels-based retailer by KHH (5 slits in well + 5 adjustment screws on botton side edge) but often mistaken as Dennert & Pape because of model no. - V & W scales in well of stock + conversion tables on back - see also identical model sold by Ahrend & OHICO |
|
Kembo-Cuisenaire | |||
Model | Type | Comments | Thumbnail |
MasterKey | Music Transposer poly-slide (2) | Thick plastic construction with copyrighted design by Australian A.B. Packer + later version was duplex blue & white |
![]() ![]() |
Kemigravyr AB | |||
Model | Type | Comments | Thumbnail |
M 3134-701 | Photography | Made for Swedish Air Force (coat of arms top left) for aerial photography |
![]() ![]() |
KENT | |||
Model | Type | Comments | Thumbnail |
(NoName) | Pocket Rietz two-tone | OEM by Uchida for Dutch retailer KENT |
|
7153 | Rietz-like two-tone | OEM by Uchida for Dutch retailer KENT + unusually & handier Rietz layout of scales all on front face - cm & 1/20 inch on back |
|
7153 LL | Darmstadt two-tone | OEM by Uchida for Dutch retailer KENT - cm & 1/20 inch on back |
![]() ![]() |
Keuffel & Esser (K&E) | |||
Model | Type | Comments | Thumbnail |
4012 (type 2) Thacher's Calculating Instrument | Desktop Basic long-scale | Special anniversary gift from Ros - serial no. = 1685 |
![]() ![]() |
4051 | Desktop Enhanced Mannheim | Serial no. 322 + 5 adjustment screws & conversion table on back |
|
4080-5 | Desktop Decitrig Log-Log | Serial no. 445698 |
![]() ![]() |
4081-5 | Desktop Decitrig Log-Log | Serial no. 902506 |
![]() ![]() |
N-4053-5 | Desktop Polyphase Enhanced Mannheim | N prefix = new/modified version & Polyphase = K&E name for Mannheim + serial no. 740727 + 5 adjustment screws & conversion table on back |
|
N-4088-5 | Desktop Technical | N prefix = new/modified version + serial no.: 235840 |
![]() ![]() |
N-4096 | Desktop Merchants' Business | N prefix = new/modified version + serial no. 699855 + stripped back scale layout for just x, ÷ & proportions + 5 adjustment screws & conversion table on back + with the lid open can be used in box! |
![]() ![]() |
N-4101 | Desktop Stadia Topography - 360g | N prefix = new/modified version + serial no. 106473 + 5 adjustment screws & conversion table on back |
![]() ![]() |
Short Base Triangulation | Desktop Military Artillery Range Finding | Specially produced chunky model with a Mannheim-like layout based on Mils - read more ... |
![]() ![]() |
Kienzle | |||
Model | Type | Comments | Thumbnail |
Multiplikator | Wristwatch Calculator Basic | A gift from Ros - manual winding with date function |
![]() ![]() |
Tachograph | Transport | Cursor so constructed that a paper disk slides under it & over central nut |
![]() ![]() |
Kingson | |||
Model | Type | Comments | Thumbnail |
Four-Rule Calculator | Pocket Mannheim Addiator | Traditional 6 slides x 6 digit display slide adder on front/top with Table of Decimal Equivalents & slide rule on back but otherwise blatant Hong Kong copy of German-made ARITHMA + impractically inch & cm scales (top & bottom edges) are on front of slide but remain for the most part hidden from view |
![]() ![]() |
Pocket Calculator | Pocket Slide Adder | For adding/subtracting - table of decimal equivalents under subtraction section but otherwise blatant Hong Kong copy of ARITHMA |
![]() ![]() |
Klawun, Joe | |||
Model | Type | Comments | Thumbnail |
1001 T (F-C 67/22) | Pocket Business - System Klawun | OEM version made by Faber-Castell for pre-decimal British £sd |
![]() ![]() |
1001 Ü (F-C 44/22) | Desktop Business | OEM version made by Faber-Castell - British pre-decimal + 6 slide tension adjustment screws in bottom side edge + pictorial instructions & tables of constants on back |
![]() ![]() |
16 C (F-C 67/91) | Pocket Enhanced Mannheim | OEM version made by Faber-Castell |
|
KLPV - Factory for Calculating Instruments - Kiev | |||
Model | Type | Comments | Thumbnail |
(NoName) | Rietz | ROCT (GOST) Russian State Standard No. = 5161-57 + two open windows with cursor line in back |
|
Koch, Huxhold & Hannemann (KHH) | |||
Model | Type | Comments | Thumbnail |
(NoName) | Electro | 5 slits + name & Hamburg & V & W scales in well of stock + typical 5 slide tension adjustment screws in bottom side edge + table of conversion factors & 2 cursor windows in back |
![]() ![]() |
1050 | Desktop Rietz | On balance probably KHH-made (some but not all of typical KHH traits) but mysteriously “Sistema Rietz” (Spanish) in gold lettering on slipcase & stamped in well of stock - paper data slip missing from back |
![]() ![]() |
System Korte | Arithmetic | German Registered Design (DRGM 699 054) from 1919 by Friedrich Korte for all 4 primary mathematical operators (x ÷ + - ) when calculating with large (long) numbers - inch scale upside down on bottom side edge |
![]() ![]() |
System Mannheim | Enhanced Mannheim | 5 slits + name & Hamburg in well + typical 5 slide tension adjustment screws in bottom side edge + table of conversion factors & 2 cursor windows in back |
![]() ![]() |
Walter Pfeffer | Pipe Flow in sewerage pipes | Special commission for German engineering company: Walter Pfeffer Nachf, Halle - two filling height tables for circle & oval profile pipes on back |
![]() ![]() |
KUTSUWA | |||
Model | Type | Comments | Thumbnail |
FN-401 | Pocket Enhanced Mannheim without Trig scales | ||
FN-801 | Enhanced Mannheim | Billed as Pocket Basic Mannheim model but is too long for any pocket & has Trig scales |
|
L&C Hardtmuth / Classic | |||
Model | Type | Comments | Thumbnail |
Series I | Mannheim | Unusually for any maker top edge is flat & bottom edge is bevelled - bottom bevelled cm edge scale upside down + table of constants on back |
|
Series I | Pocket Mannheim | Top bevelled edge inch scale upside down + table of constants on back | |
Series II | Log-Log | Bottom edge cm scale upside down + table of constants on back | |
Series II | Pocket Log-Log | Bottom edge cm scale upside down + table of constants on back |
|
Series III | Pocket Mannheim | Bottom bevelled edge cm scale upside down + unit of measure extension (inch) scale in well of stock + table of timber constants on back | |
Series IV | Mannheim + Trig | Strange/unusual scale layout - bottom bevelled edge cm scale upside down + table of constants on back | ![]() ![]() |
Series V | Log-Log extra | Series model no. strangely left off - unusual choice of scales - bottom bevelled edge cm scale upside down + table of constants on back |
![]() ![]() |
Series VI | Retail & Monetary | Based on patent GB621133 (A.W. Parkes) for pre-decimal pounds sterling + bottom bevelled edge cm scale upside down |
![]() ![]() |
Lawrence Engineering Services | |||
Model | Type | Comments | Thumbnail |
10-B blue | Enhanced Mannheim without Trig scales | Monchrome blue version of standard 10-B with conversion tables on back |
|
10-B DeLuxe | Enhanced Mannheim without Trig scales | DeLuxe = magnifying cursor. Conversion tables on back of rule | |
10-B DeLuxe (ver. Grosset & Dunlap) | Book + Enhanced Mannheim without Trig scales | How To Use It (instructions & tests) dirty orange & black book by Sommers/Drell/Wallschlaeger & published by Grosset & Dunlap |
![]() ![]() |
10-B DeLuxe (ver. Wilcox & Follett) | Book + Enhanced Mannheim without Trig scales | How To Use It (instructions & tests) dark-green & gold book by Sommers/Drell/Wallschlaeger & published by Wilcox and Follett Co. with extra loose-leaf Answers addendum + slide rule in back |
![]() ![]() |
10-B OEM | GENE LOEWY Enhanced Mannheim without Trig scales | name on enevelope not rule | |
10-B OEM | LARCH Enhanced Mannheim without Trig scales | name on enevlope not rule | |
10-B original | Enhanced Mannheim without Trig scales | Early & famous 25¢ slide rule - read more …. |
|
10-B standard | Enhanced Mannheim without Trig scales | Conversion tables on back |
![]() ![]() |
10-C | Engraver's and Photographer's Proportion Calculator | For area % up & down scaling |
![]() ![]() |
10-D | Lumber Calculator - basic version | For lumber volume in board feet |
![]() ![]() |
10-D0 | Lumber Calculator | For lumber volume in board feet |
![]() ![]() |
10-F | Pricing and Inventory Rule | For discount or profit margin mark-up per gross/dozen/each in $‘s |
![]() ![]() |
10-G | Cutting Speed Calculator | For recommended machining cutting speed in f.p.m for given drill speed & size |
![]() ![]() |
10-I | Model Builder's Slide Rule | For calculating the scaled down dimensions (various railway gauge sizes) for replica scaled models of railroads/trains |
![]() ![]() |
10-N | Printer's Proportion Rule | For moving between inches & picas when printing/publishing |
![]() ![]() |
12-H | Copyfitter printing | For font size and letter/word/line spacing in points and picas - layout © Owen T. Taylor |
![]() ![]() |
12-J | Pro-Rater | For calculating days between two dates & pro-rata premium/days |
![]() ![]() |
250-BT | Enhanced Mannheim | Conversion tables on back |
![]() ![]() |
250-BT OEM | CHARVOZ-ROOS SR31 Enhanced Mannheim | Conversion tables on back |
![]() ![]() |
250-BT OEM | DU PONT Enhanced Mannheim | Conversion tables on back | |
250-BT OEM | LIETZ 2974N Enhanced Mannheim | Conversion tables on back |
![]() ![]() |
250-BT OEM | US NAVY Enhanced Mannheim | Conversion & gauge marks tables on back |
![]() ![]() |
250-V | Enhanced Mannheim | Marketed as a “Professional Slide Rule” - conversion tables on back |
![]() ![]() |
6-Op | Pocket Photography Calculator - early | For Photoflash Lamps but missing top colour film scale found on the later Flashrule version - photography tips printed on back |
![]() ![]() |
6-Op | Pocket Photography Flashrule | For GE or Westinghouse Photoflash Lamps - photography tips printed on back |
![]() ![]() |
6-Ow | Pocket Photography Flashrule | For WABASH Photoflash Lamps - photography tips printed on back |
![]() ![]() |
8-A | Mannheim | Conversion table printed on back - Wabash made |
![]() ![]() |
8-B | Enhanced Mannheim without Trig scales | Conversion table printed on back - Wabash made |
![]() ![]() |
8-B OEM | ANCO Enhanced Mannheim without Trig scales | Paper table of decimal equivalents on back |
![]() ![]() |
8-B OEM | DU MONT Enhanced Mannheim without Trig scales | ||
8-L | Copper Wire Selector | For minimum wire size/volt (440/220/110) in A.W.G. - conversion tables on back |
![]() ![]() |
8-L | Copper Wire Selector - basic Cedar Valley version | For minimum wire size/volt (440/220/110) in A.W.G | |
9-K | Music Transposer | For constructing chords in any key & transposing one key to any other |
![]() ![]() |
B.F. Grizzle | Gas Displacement Meter Calculator | Specially commissioned by B.F. Grizzle for calculating gas rates through displacement meters @ various pressures - layout © B.F. Grizzle |
![]() ![]() |
B.F. Grizzle | Gas Low Pressure Line Flow Capacity Slide Rule | Specially commissioned by B.F. Grizzle for calculating open flow rates using pilot tube pressure readings - layout © B.F. Grizzle based on Spitzglass’ formula |
![]() ![]() |
B.F. Grizzle | Pipe Flow for gas | Specially commissioned by B.F. Grizzle for calculating the gas flow capacity/hour through a pipe of a given diameter - layout © B.F. Grizzle based on Panhandle Eastern Pipe Line formula |
![]() ![]() |
B.F. Grizzle | Pipe Flow for water | Specially commissioned by B.F. Grizzle for calculating the friction loss in a section of water pipe & head loss for a given pipe diameter, length & flow - layout © B.F. Grizzle based on Hazen–Williams equation |
![]() ![]() |
B.F. Grizzle | Pipe Open Flow Capacity | Specially commissioned by B.F. Grizzle for calculating open flow rates based on pilot tube pressure readings & using Reid’s formula for pipe profiles - layout © B.F. Grizzle |
![]() ![]() |
B.F. Grizzle | Pipe Orifice Meter Calculating Rule | Specially commissioned by B.F. Grizzle for calculating the size of conduit restriction needed to create a required pressure drop - layout © B.F. Grizzle |
![]() ![]() |
Canadian Radium & Uranium | Gamma-Ray Radiographic | Specially commissioned by Canadian Radium & Uranium Corp. for commercial (steel or alloys) rather than medical use - for determining the appropriate exposure times for radiographic images involving radium-226 sources |
![]() ![]() |
Caprock | Concrete Quantity Calculator | Specially commissioned by Caprock Materials Co. for calculating cubic yards of concrete needed for or in a wall of certain dimensions |
![]() ![]() |
Code-Maker | Pocket (boxed pair) | Rules carry an advertisement for Robin Company, Chicago |
![]() ![]() |
Code-Maker | Pocket Beich | Part of loyalty scheme for sales of WHIZ chocolate bars |
![]() ![]() |
Code-Maker | Pocket Dick Tracy | Because of the Dick Tracy connection presumably marketed in cooperation with the “Chicago Tribune New York News Syndicate” |
![]() ![]() |
Fun Incorporated | Pocket Poker Meter Gambling | Specially commissioned by Fun Incorporated + © design from 1950 by Ideas Unlimited read more … |
![]() ![]() |
L.E. Waddington | Music & Music Acoustics | Specially commissioned by L.E. Waddington for adjusting relative vibration rates, degrees of scale, intervals, chord structures, scale indications & transposition data against a piano keyboard - based on several standard frequency level specifications - layout © L.E. Waddington - Reference Frequency table in well - Subscript Notation, Instrument tables, Time Signatures & nomograms on back |
![]() ![]() |
Madison | Cutting Speed Calculator | Specially commissioned by Madison Manufacturing Company for calculating the drill and cutting speed for machining a given diameter - extra tables on back |
![]() ![]() |
Miller Motor | Air and Hydraulic Cylinder Calculator | Specially commissioned by Miller Motor Company for calculating air & hydraulic cylinder values such such as thrusts, bores, areas displacements, etc - conversion tables on back |
![]() ![]() |
MIT Antenna | Radar antenna performance | Specially commissioned by Massachusetts Institute of Technology (MIT) for calculating an antenna’s beam width as a function of the diameter of the antenna & wavelength being used + scales for converting imperial to metric & radians to degrees - design based on research by Roy C. Spencer (RSC) for calculating radar antenna beam patterns, beam width, gain, etc. Its use, for a slide rule, was uniquely classified by both UK & US governments during WWII. |
![]() ![]() |
Murphy & Murphy | Concrete Quantity Calculator | Specially commissioned by Murphy & Murphy Inc. for calculating cubic yards of concrete needed for or in a wall of certain dimensions |
![]() ![]() |
Pioneer | Epperson TV coverage calculator | Specially commissioned by Pioneer to calculate approximate 'Grade A,' 'Grade B' & 'Principal City' Coverage for all VHF and UHF Television Stations from TV station's published power & antenna height + gives approximate field strength in microvolts/meter for distances up to 100 miles from transmitter + UV/M-DB conversion scale on back - layout © J.B. Epperson |
![]() ![]() |
Plaza Express | Traffic Manager's | Specially commissioned by Plaza Express Company Inc. for checking freight shipping charges or shipping rates or shipping truck/carload breaking points & calculating storage costs - layout © M.T. Brockman |
![]() ![]() |
RCA | F.M. coverage calculator | Specially commissioned by Radio Corporation of America for estimating coverage of FM radio stations according to the type of RCA antennae |
![]() ![]() |
Statham Laboratories | Poker Meter Gambling | Specially commissioned by Statham Laboratories + © design from 1950 by Ideas Unlimited read more … |
![]() ![]() |
Taylor Publishing | Copyfitter printing | Specially commissioned by Taylor Publishing Co. with scale layout © Owen T. Taylor & identical to 12-H + CCP paper table gives Characters Per Pica for extensive list of different type faces & fonts for both upper & lower case - |
![]() ![]() |
Tenbrook | L.P. Gas | Specially commissioned by Tenbrook Enterprises for calculating the temperature correction (°F) needed when making bulk deliveries of Propane |
![]() ![]() |
Thomas | Music Composition & Transposer | Specially commissioned by Thomas Specialities for composing, transposing or creating harmonies - layout © Thomas |
![]() ![]() |
Tokheim 92 | K Factor Heating Oil Supply | Specialty commissioned by Tokheim Oil Tank & Pump Corp. for calculating supply requirements of household heating/fuel oil - K factor is a way of showing (gallons/degree day) how fast a consumer uses fuel (analogy = miles/gallon in a car) |
![]() ![]() |
US Army (DeYOE) | Military Artillery Range Finding | Specially commissioned by US ARMY + called a “Graphic Table” by the US military & used for “Bracketing” i.e. flooding an area with shells rather than precise aiming - “Y” probably refers to Howitzer gun & “OE” = observed errors + Mils range suggests mortar shelling |
![]() ![]() |
US Aviation Underwriters | Insurance | Specially commissioned by United States Aviation Underwriters Inc. for actuarial-based calculations + table on back for cancellation ratio’s/days - layout © Albert J. Smith |
![]() ![]() |
Le Girondin - ELPE | |||
Model | Type | Comments | Thumbnail |
TOTALIS | Slide Adder | Marketed for pre-Euro (2000) calculating in French Francs (Fr) & Centimes |
![]() ![]() |
Leningrad Factory | |||
Model | Type | Comments | Thumbnail |
(NoName) | Desktop Military Artillery Range Finding | Made in the style of earlier Russian Prometei-made military/pilot slide rules. Intriguingly the military RWTL-2 labelling (in German) on the box stands for Rockets and Weapons Storage - 2 @ Hennersdorfer Heide, Lower Austria. |
![]() ![]() |
LFAI - Leningrad | |||
Model | Type | Comments | Thumbnail |
(NoName) | Desktop Rietz | ROCT (GOST) Russian State Standard No. = 5161-57 + conversion factors & formulas on back |
|
(NoName) | Pocket Rietz | ROCT (GOST) Russian State Standard No. = 5161-57 + two open windows with cursor line in back |
|
(NoName) | Rietz | ROCT (GOST) Russian State Standard No. = 5161-49 + conversion factors & formulas on back |
|
Lines Bros Ltd / Tri-ang | |||
Model | Type | Comments | Thumbnail |
C276 Scalextric Speed Computer | Time-Speed-Distance calculator | Scalextrix model car racing sets (now distributed by Hornby) date from 1950s - calculator gives scaled (32:1) equivalent MPH or KPH for distances travelled for clocked no. of seconds - track slot lengths/type in cm for finding total track length on back |
![]() ![]() |
LINEX | |||
Model | Type | Comments | Thumbnail |
(NoName) | Enhanced Mannheim | Two spring-loaded ball bearings in top side of well to tension slide. Read more ... |
![]() ![]() |
1253 | Pocket Mannheim | Unbranded |
![]() ![]() |
LOFTUS, William R. | |||
Model | Type | Comments | Thumbnail |
(NoName) | Alcohol Gauging, Ullaging & Reducing poly-slide(2) spile rod set | 6 round spile rods screw together to make 5 foot dipping rod with inch & imperial gallon scales + front face for Gauging & Ullaging calculations & reverse side for Reducing & Stocktaking calculations |
![]() ![]() |
Sikes' 6187 | 1-rule Alcohol Hydrometer set | Layout on back of Proof rule merely extends range from front + hydrometer scale runs from 0-10 range + full set of 9 brass weights (10 - 90) all stamped: 6187 + thermometer by J. Casartelli & Son |
![]() ![]() |
LOGA Calculator A.G. | |||
Model | Type | Comments | Thumbnail |
15m (ver. E) | Desktop Basic long-scale | Serial No. 155202 (“15” correlates to scale length & “5202” = no.) + version “E” = Einfach/elementary |
![]() ![]() |
2.4m (ver. E) | Desktop Basic long-scale - yellow | Serial No. 2237 (possibly correlates to overall scale length) + version “E” = Einfach/elementary |
![]() ![]() |
30E (ver. 2) | Basic | Model suffix “E” = Einfach/elementary - budget 3-spoke metal backplate - see also bigger sibling |
![]() ![]() |
30RC (ver. 2) | Business | Serial No. 65 + model suffix “R” = with reciprocal scale & “C” = commercial + turning lever - try out here the online simulation created by Andries de Man |
![]() ![]() |
30RZh | Retail/Conversion | Serial No. 0289 + model suffix “R” = with reciprocal scale, “Z” = extra Zins/interest scale & “h” = with turning lever - see also bigger sibling |
![]() ![]() |
30sR (ver. 2) | Basic+ | Model suffix “s” = lightweight construction & “R” = with reciprocal scale + back anodised brass colour & serrated/knurled edge to disc |
![]() ![]() |
30sT (ver. 1) | Technical | Model suffix “s” = lightweight construction & “T” = Technisch/technical scales + budget 3-spoke metal backplate - see also bigger sibling |
![]() ![]() |
30Tt/360º | Technical | Serial No. 64207 + model suffix “T” = technical scales & “t” = with trig scales + black turning lever - try out here the online simulation created by Andries de Man |
![]() ![]() |
30Tt/360º | Technical - early | Serial No. 1659 + model suffix “T” = technical scales & “t” = with trig scales + grey turning lever - try out here the online simulation created by Andries de Man |
![]() ![]() |
7.5m (ver. E) | Desktop Basic long-scale - white | Serial No. 751030 (“75” correlates to scale length & “1030” = no.) + version “E” = Einfach/elementary |
![]() ![]() |
75 Praezision 6400 A 0/00 | Desktop Military Artillery/Stadia Topography | Serial No. 82 with sin, cos & tan scales calibrated in 6400 NATO Mils favoured by the military + sin & cos scales are divided into 4 subscales + see also smaller siblings |
![]() ![]() |
75E | Desktop Basic long-scale | Model suffix “E” = Einfach/elementary - see also smaller sibling - try out here the online simulation created by Andries de Man |
![]() ![]() |
75EA | Desktop Basic/Monetary/Conversion long-scale | Serial No. 3474 + model suffix “E” = Einfach/elementary & “A” = additional scales for GBP & imperial/metric conversions - try out here the online simulation created by Andries de Man |
![]() ![]() |
75RZ (ver. 2) | Desktop Retail/Conversion long-scale | Serial No. 4100 + model suffix “R” = with reciprocal scale & “Z” = extra Zins/interest scale - see also smaller sibling |
![]() ![]() |
75T | Desktop Technical long-scale | Model suffix “T” = Technisch/technical scales + more accurate later addition to product range marketed to both schools & commerce - see smaller sibling - try out here the online simulation created by Andries de Man |
![]() ![]() |
K150d | Pocket Technical/Business Rietz-like | Model prefix “K” = Kaufmann/merchant & suffix “d” = Duits/German version + unusually separate slide for each side of closed frame i.e. front (yellow slide) for business use & back (green slide) for technical use + many currency gauge points on front face/cursor + adjoined CI/% = ½ length scales + table of gauge points abbreviations in front well + table of constants in well on back - see also bigger sibling |
![]() ![]() |
K300d | Technical/Business | Model prefix “K” = Kaufmann/merchant & suffix “d” = Duits/German version + unusually specific slide for each side of closed frame i.e. front (yellow slide) for business use & back (green slide) for technical use + many currency gauge points on front face/cursor + adjoined CI/%/§ on front = mini scales + table of gauge points abbreviations in front well + % scale on back = 2-part - see smaller pocket sibling |
![]() ![]() |
Topo 6400 A 0/00 (ver. 2) | Military Artillery/Stadia Topography - early | Serial No. 195 exclusively made for Swiss Army for artillery based azimuth calculations - two inner scales on front calibrated for 6400 A ‰ or NATO Mils (A ‰ = 2 x 3200) + see also larger sibling |
![]() ![]() |
Topo 6400 A 0/00 (ver. 3) | Military Artillery/Stadia Topography | Serial No. 1119 exclusively made for Swiss Army for artillery based azimuth calculations - two inner scales on front calibrated for 6400 A ‰ or NATO Mils (A ‰ = 2 x 3200) + see also larger sibling - try out here the online simulation created by Andries de Man |
![]() ![]() |
Wetter (30E) | Basic | Specially commissioned 30E for advertising by Zurich-based Wetter - budget 3-spoke metal backplate |
![]() ![]() |
LOGAREX | |||
Model | Type | Comments | Thumbnail |
27204-II | Pocket Rietz | cm & inch scales, table of constants & two windows in back |
|
27205 | Pocket Log-Log | Toison D’Or award logo on front face |
![]() ![]() |
27403-II | Darmstadt - early | Thick milky white plastic + two windows with hairline in back |
![]() ![]() |
27403-III | Darmstadt-like | Inch scale, table of constants & two windows with hairline in back |
|
27602-II | Log-Log | Toison D’Or award logo on front face |
![]() ![]() |
27606 SKRIVAB TRIG | School/Technical | ![]() ![]() | |
27607-I | Technical | ![]() ![]() | |
4542-27501 | Desktop Rietz-like | Interesting & useable layout of scales |
![]() ![]() |
Logomat Rechengeräte | |||
Model | Type | Comments | Thumbnail |
Eckardt | Conversion | Slide chart specially commissioned Eckardt Mess- und Regeltechnik - pressure conversion on front & temperature conversion on back |
![]() ![]() |
1300/1301 | Pocket Basic long-scale | Stands out from Basic models from other makers because of quality & long-scale spiral D scale |
![]() ![]() |
1300/1302 | Pocket Basic long-scale | Stands out from Basic models from other makers because of quality & long-scale spiral D & K scales |
![]() ![]() |
2001 PfiffiKUS | Waistcoat Basic long-scale - early | PffifiKUS = smart aid (later version duplex) - innovative but impractical single scale design & a pain to calculate with |
![]() ![]() |
2300 | Universal long-scale | Superb & unusual design + magnifying bar held in position magnetically + 6 interchangeable discs/scale layouts |
![]() ![]() |
3301 | Pocket Retail | Increased accuracy because of extra-long D scale |
![]() ![]() |
4605 Tankboy | Pocket Conversion | Slide chart for fuel(tank) consumption |
![]() ![]() |
5105 pr‰miller | Pocket Alcohol | For calculating legally allowable units of alcohol/type of drink for given body mass |
![]() ![]() |
De Beers | Retail | Slide chart specially commissioned by De Beers Industrial Diamond Division |
![]() ![]() |
Kalorien Zaehler | Medical | Slide chart for calorie counting based on patented (DE2160413) design by Heinrich Kundisch + table of calorific values of many foods |
![]() ![]() |
Long, Joseph | |||
Model | Type | Comments | Thumbnail |
(NoName) | Alcohol Proof | Layout on back merely extends range from front |
|
(NoName) | Alcohol Proof - narrow | Layout on back merely extends range from front + narrow as a pocket model but longer |
|
Lumley, L. & Co. | |||
Model | Type | Comments | Thumbnail |
(NoName) | Pocket Alcohol Proof | Layout on back merely extends range from front |
|
M & M Enterprises | |||
Model | Type | Comments | Thumbnail |
Circle-O-Keys | Pocket Music Composition | Slide chart patented (US2079920) design by Thomas J. Ozanda for musical signatures of various major & major keys |
![]() ![]() |
MARC A.A.F. / MINERVA | |||
Model | Type | Comments | Thumbnail |
Minerva No. 5 Electricien | Pocket Electro | V & W scales in well of stock - from short lived MARC-Minerva collaboration before Minerva started importing ARISTO slide rules | |
No. 2 Mannheim | Pocket Mannheim | Inch scale & André et Yernaux, Courcelles on back | |
No. 2 Mannheim | Pocket Mannheim - early | Early cursor & overall 5cm shorter than later versions - Cement-Ijzerfabriek “Wittenburg”, Amsterdam stamped in well - inch scale on back | ![]() ![]() |
No. 4 Sinus et Tangente | Pocket Enhanced Mannheim | ||
No. 5 Electricien | Pocket Electro | V & W scales in well of stock - later plastic rather than celluloid stock | ![]() ![]() |
No. 6 Rietz | Pocket Rietz | ||
Markes & Co. | |||
Model | Type | Comments | Thumbnail |
De Keline Rekenmeester | Child's Colum Adder | Little Accountant abacus-like preparatory aid for adding & subtracting numbers (display window can be closed for self-checking) made under German maker's DUX brand name but sold by Dutch retailer J.B. Wolters- |
![]() ![]() |
Master | |||
Model | Type | Comments | Thumbnail |
Business | Slide Adder | Maker is Liege, Belgium based (no connection to US based Master Electric maker) - “man in cap” 1 of 3 company logo’s - addition only |
![]() ![]() |
Maurice Damien | |||
Model | Type | Comments | Thumbnail |
SP 10 Universal | Rietz (Type 4) | Unusually all-metal for a European maker - table of conversion factors in German on back + company logo = dam - one only 3 known linear models |
![]() ![]() |
Mear & Co., M.H. | |||
Model | Type | Comments | Thumbnail |
Domestic Heating Calculator - model 4 imperial | Heating installation design for traditional houses & bungalows - early | St. Helen’s Gate address - determines the heating requirements for older norms/types of domestic premises & also the sizes of all the equipment needed for ‘the installation” |
![]() ![]() |
Domestic Heating Calculator - model 9 metric | Heating installation design for houses & bungalows | Determines the heating requirements for older norms/types of domestic premises & also the sizes of all the equipment needed for ‘the installation” | ![]() ![]() |
Electrical Lighting Calculator | Lighting/illumination | Should be used in conjunction with the Glare Index Calculator to calculates light requirements for commercial & industrial premises in lumens - table of coefficients of light fittings on back. |
![]() ![]() |
Gas Flow Calculator - model 3 | High or low pressure gas flow in steel pipes | Single-sided - Model 3 = improved model based on Colebrook-White formula (replaced Lacey’s coefficients for such calculations) | ![]() ![]() |
Glare Index Calculator - metric | Lighting/illumination glare | Used in conjunction with Electrical Lighting Calculator to calculate a glare index according to the British Lighting Council method. |
![]() ![]() |
Gommer Comprehensive Conversion Calculator | Conversion | Special commission for J. Gommer, Voorburg, NL - 2nd disc with multiple look-up windows on front - cursor on back | ![]() ![]() |
Orifice & Nozzle Flow Calculator - metric | Pipe Flow (liquids/gases/steam) | For calculating flow in pipes for various types of orifice plates & nozzles according to British Standard 1042 (pipe bores 40-2,000mm & orifice diameter 7-1,200mm) - front for results in volume or mass - back for flow coefficients |
![]() ![]() |
Pipe Flow Calculator | Pipe Flow (liquid & gas - turbulent flow) | Special commission by JISKOOT Automation n.v., Breda, NL + for determining pipe size, flow or pressure loss for any liquid, e.g. water, fuel oils, acids, solvents & any gas (at low pressures) flowing under turbulent conditions in steel or cast iron pipes |
![]() ![]() |
Smith Conversion Calculator | Conversion | Special commission for A O Smith Corp. London - 2nd disc with multiple look-up windows on front |
![]() ![]() |
SRA Helical Coil Spring Calculator - metric | Designing tension or compression in helical springs | Special commission for Spring Research Association (SRA) - for designing helical coil springs according to BS 1726 part 1 - will handle springs made from round, square or rectangular section wire |
![]() ![]() |
Warm Air Heating Calculator - model 2 imperial | Warm air domestic & small installations | Divided into sections each dealing with a particular aspect of the overall calculation | ![]() ![]() |
Water Flow Calculator - model 3 imperial | Pipe Flow | Front for determining flow of water through pipes & ducts with circular cross-section according to Moody’s coefficients - back for determining flow of water in large open channels of any cross-section (Manning formula) |
![]() ![]() |
Mears, Neal F. | |||
Model | Type | Comments | Thumbnail |
Marvel | Music Transposer | Slide chart copyrighted design by Neal F. Mears & promoted as: The Slide-Rule of Music |
![]() ![]() |
Meierhofer (Hans) | |||
Model | Type | Comments | Thumbnail |
11054 Swiss Navigator | Aviation - System Borner | “Book” construction with multiple ring-bound nested discs - patent no. (CH341321) by Armin Borner |
![]() ![]() |
MEISSNER KG | |||
Model | Type | Comments | Thumbnail |
(NoName) | Rietz | Later versions followed - table of conversion factors on back |
|
Rietz-Arcus 1731543 | Rietz-like | Missing usual K & A/B scales of a Rietz layout + unusually for a Rietz all scales on front face - “1” in equilateral triangle = East German (DDR) post 1950 certification mark for “1st or good quality” | ![]() ![]() |
TRIM | Technical | Unusual choice of scales & layout -“1” in equilateral triangle = East German (DDR) post 1950 certification mark for “1st or good quality” + heated stamped “93” on back |
![]() ![]() |
Meiwa | |||
Model | Type | Comments | Thumbnail |
Alexe | Column Adder | Japanese-made patented simple calculator but switchable between addition & subtraction modes |
![]() ![]() |
Morin, Henri | |||
Model | Type | Comments | Thumbnail |
Regle pour Essais des Duretes des Metalix | Set for testing metal hardness | Table of conversion factors on back + 12 varying steel weights + set of test slides (wrapped) + rubber + heavy sprung testing piston/hammer | ![]() ![]() |
MuseLab Inc. | |||
Model | Type | Comments | Thumbnail |
Bluesession | Music Teaching Guitar Playing | Slide chart patented (US5386757) design by Daniel Derrick displaying fingering patterns for 6-string rock & blues guitar |
![]() ![]() |
Music Rule Co. | |||
Model | Type | Comments | Thumbnail |
Music Rule | Music Piano Sharps & Flats | Slide chart for finding sharps & flats for a given key on piano keyboard |
![]() ![]() |
Musigraph Company | |||
Model | Type | Comments | Thumbnail |
100 | Music Composing & Arranging | Designed by two professional musicians for professional composers/arrangers + supposedly only 5000 ever made |
![]() ![]() |
Muziekuitgeverij van Teeseling | |||
Model | Type | Comments | Thumbnail |
VT180 Guitar-Disk | Music Guitar Composition | Slide chart copyrighted by Dutch publishers for finding guitar keys (front) & guitar chords (back) |
![]() ![]() |
National Rechenwalze, A.G. | |||
Model | Type | Comments | Thumbnail |
10 | Desktop Basic long-scale | serial no. = 3545 with knurled metal turning knob - stand allows drum to be locked vertically to save desktop space |
![]() ![]() |
Nestler | |||
Model | Type | Comments | Thumbnail |
(NoName) | Desktop Military | Both non-standard scales folded & apart from NESTLER name in well no other markings |
![]() ![]() |
(NoName) | Enhanced Mannheim | Railway track scales + German silver screws + cm scale in well of stock + patent no. 173660 + table of conversion factors on back |
|
(NoName) | Enhanced Mannheim - early | Railway track scales + German silver screws + cm scale & 4 slits in well of stock + patent no. 164885 + table of conversion factors on back |
![]() ![]() |
(NoName) | Enhanced Mannheim - export Pickworth | German silver screws + inch scale in well of stock + table of conversion factors compiled by C.N. Pickworth on back |
|
(NoName) | Mannheim | Unusually unmarked (pi mark = Nestler) & incised scales + table of conversion factors in English on back |
![]() ![]() |
0121 | Pocket Darmstadt two-tone | 2 cursor windows in back |
|
0123 | Pocket Rietz 360 | aku CMC printed on back + 2 cursor windows |
|
0123 (Reitz S) | Pocket Rietz 360 two-tone | 2 cursor windows in back |
|
0127 | Pocket International Conversion two-tone | primarily for imperial/metric conversions with many gauge marks on front face + WEATHERFORD printed on back + 2 cursor windows |
![]() ![]() |
0129 Polymath | Pocket Log-Log | OEM by FUJI but retailed through Hope Slide Rule Mfg. Co. - has big-brother 0291 sibling |
![]() ![]() |
0137 | Pocket Electro two-tone | Unusually W & V scales on front face + 2 cursor windows in back |
![]() ![]() |
0203 Alpha | Demonstration Rietz two-tone | Instruction rule for model 0251 - Rietz layout but all scales on front face |
![]() ![]() |
0210 | Darmstadt | Table of conversion factors & two cursor windows in back |
![]() ![]() |
0215 | Desktop Darmstadt 360° | tables of conversion factors on back |
|
0218 | Darmstadt | Table of conversion factors on back + 2 cursor windows |
|
0232 | Rietz | Late wooden model - table of conversion factors on back + 2 cursor windows |
|
0235 | Desktop Rietz | tables of conversion factors on back |
|
0238 | Rietz two-tone | Table of conversion factors & 2 cursor windows in back |
|
0239 | School Rietz two-tone | Cheaper construction & possible OEM by Japanese Fuji + 2 cursor windows in back |
|
0249 Elemath | School Log-Log two-tone | OEM by Japanese Fuji but retailed through Hope Slide Rule Mfg. Co. |
![]() ![]() |
0251 Alpha | School Rietz two-tone | Cheaper construction & possible OEM by Japanese Fuji + “Half-duplex” layout with trig scales on back of closed frame stock - part of mini Secondary School series |
|
0252 Beta | School Technical two-tone | Cheaper construction & possible OEM by FUJI - part of mini Secondary School series |
![]() ![]() |
0253 Gamma | School Technical two-tone | Cheaper construction & possible OEM by FUJI - part of mini Secondary School series |
![]() ![]() |
0254 Delta | School Technical/Log-Log two-tone | Cheaper construction & possible OEM by FUJI - part of mini Secondary School series |
![]() ![]() |
0260 | Machining Time | Table of guidelines for turning speeds + 2 cursor windows in back |
![]() ![]() |
0270 | Technical long-scale | Table of constants on back + bigger sibling 0275 |
![]() ![]() |
0275 | Desktop Technical long-scale | Tables of conversion factors + 2 cursor windows in back - long scales (folded @ Pi) & desktop model meant accuracy of 0.03% + smaller sibling 0270 |
![]() ![]() |
0291 Polymath-Duplex | Technical/Log-Log | OEM by FUJI but retailed through Hope Slide Rule Mfg. Co. - see also smaller 0129 sibling |
![]() ![]() |
0292 Multimath-Duplex | Technical/Log-Log two-tone | ![]() ![]() | |
0320 | Petroleum two-tone - System Dr. Schmeling | Specially marketed to Petroleum Industry for crude oil related calculations |
![]() ![]() |
0330 | Chemical two-tone | Top 2 scales & top scale on back of slide = plethora of gauge marks = table of elements & molecular weights |
![]() ![]() |
0370 | Electro | Top non-standard scale is for rapid calculation of tension losses in copper wires + bottom non-standard scale is for calculating peripheral velocities (D scale displaced by pi/6 or 0.5326) - 2 cursor windows in back + bigger sibling 0375 |
![]() ![]() |
0375 | Desktop Electro | Top non-standard scale is for rapid calculation of tension losses in copper wires + bottom non-standard scale is for calculating peripheral velocities (D scale displaced by pi/6 or 0.5326) - table of conversion factors & 2 cursor windows in back + smaller sibling 0370 |
![]() ![]() |
0408 | Finance two-tone | ![]() ![]() | |
0432 | Reinforced Concrete - System Dr. Schaeffer | Stress factors 1200 & 1400kg/cm2 of iron on either side of slide |
![]() ![]() |
0440 | Reinforced Concrete two-tone - System Maarschalk | Designed by Dutchman M.C.M. van Maarschalkerwaart but Nestler felt his full surname was too long for the System accreditation & hence shortened it! |
![]() ![]() |
10 | Enhanced Mannheim | German sliver screws + table of conversion factors on back + 2 cursor windows |
|
11 (narrow) | Pocket Enhanced Mannheim | extremely narrow & Lilliput-like footprint with no model/maker markings on rule + 2 cursor windows in back |
|
11 (ver. 1) | Pocket Enhanced Mannheim | German silver screws + Table of conversion factors & 2 cursor windows in back |
|
11D | Pocket Darmstadt | Broader than other in 11xx series 2 cursor windows in back |
|
11E | Pocket Enhanced Mannheim | orange/dirty-brown celluloid with 2 cursor windows in back |
![]() ![]() |
11M | Pocket Enhanced Mannheim | 2 cursor windows in back |
|
11O | Pocket Mannheim | unnecessarily 2 cursor windows in back |
|
11R | Pocket Rietz | 2 cursor windows in back |
|
11ZE | Pocket Electro | V & W scales in well of stock + 2 cursor windows in back |
|
11ZM | Pocket Enhanced Mannheim | 2 cursor windows in back |
|
11ZR | Pocket Rietz | Model no. etc on back + 2 cursor windows |
|
12 | Pocket Enhanced Mannheim | cm & inch scale on back + 2 cursor windows |
|
12a | Pocket Enhanced Mannheim | unmarked but reseller, P. Trumel, in well of stock + table of conversion factors on back + 2 cursor windows |
|
12b | Pocket Enhanced Mannheim | cm scale in well of stock + table of conversion factors on back + 2 cursor windows + unusual combination of magnifying cursor & extra tick marks emulates precision of 25cm model |
|
12c | Pocket Enhanced Mannheim | cm scale in well of stock + table of conversion factors on back + 2 cursor windows |
|
17 | Extra long Enhanced Mannheim | Unusual length + railway track scales + German silver screws + cm scale in well of stock |
|
18 | Desktop Enhanced Mannheim | cm scale in well of stock + tables of conversion factors on back |
|
20F/3 Kiel | Rietz | Model no. /3 suffix = 1 main cursor hairline & 2 peripheral hairlines + Kiel name (like F-C 1/94) comes from being the model favoured by German Imperial Naval Academy & School in Kiel & unusually for a Rietz has a Qo gauge mark - table of conversion factors on back + 2 cursor windows |
![]() ![]() |
21 | Darmstadt | Owned & used as a student by legendry Swiss collector Heinz Joss - 2 cursor windows in back |
|
21a | Desktop Darmstadt 360° | cm scale in well of stock + table of conversion factors on back |
|
22 | Extra long Pocket Rietz | cm scale in well of stock + table of conversion factors on back + 2 cursor windows |
|
23 | Rietz | cm scale in well + table of conversion factors on back + 2 cursor windows |
|
23a (A/R) | Desktop Rietz - late | Unusual scale length - tables of conversion factors on back |
|
23R | Rietz | cm scale in well + table of conversion factors on back + 2 cursor windows |
|
23R/3 | Rietz | Model no. /3 suffix = cursor with 3 hairlines + table of conversion factors on back + 2 cursor windows |
|
23R/3 | Rietz - early | Model no. /3 suffix = cursor with 3 hairlines + table of conversion factors on back + 2 cursor windows |
|
24 | Desktop Rietz | cm scale in well of stock + tables of conversion factors on back - ex Shell (B.P.M.) |
|
24b | Extra long Desktop Rietz long-scale | Not demonstration type but 10f only 4 engine-divided (only maker capable of desktops >50cm) + early production year from 1908-1911 style of company name - read more .... |
![]() ![]() |
24R | Desktop Rietz - late | cm scale in well of stock + tables of conversion factors on back |
|
24R/1 | Extra long Desktop Rietz long-scale | Model no. /1 suffix = cursor with 1 hairline + not demonstration type but 1 of only 4 engine-divided 100cm models (only maker capable of engine dividing desktops >50cm) |
![]() ![]() |
26 | Business & Machining | Table of machining speeds on back + 2 cursor windows |
![]() ![]() |
27 | Technical long-scale | C & D long scales folded @ Pi + S & T also long-scale + cm scale in well of stock + tables of conversion factors on back & two cursor windows + see also larger sibling |
![]() ![]() |
27a | Desktop Technical long-scale | C & D long scales folded @ Pi + S & T also long-scale + desktop model meant accuracy of 0.03% + cm scale in well of stock+ tables of conversion factors on back - long scales (folded @ Pi) & - see also smaller sibling |
![]() ![]() |
28 | Universal Stadia Topography - 360g | German silver screws - table of conversion factors on back + 2 cursor windows + see bigger sibling |
![]() ![]() |
28a | Desktop Stadia Universal Topography - 400g | Tables of conversion factors on back - model later replaced by 0286 Geometer + see smaller sibling |
![]() ![]() |
3 | Mannheim | SUPPLIED BY ASTON & MANDER LONDON in well |
|
31 | Timber | For all aspects of timber industry (round & square timber ) - same model used by Albert Nestler (1851-1901) to calculate raw material needed for making wooden slide rules - cm & inch scales + 3rd party name Vollmer-Werke A.G. |
![]() ![]() |
33 | Chemical | German sliver screws - table of atomic weights on back |
![]() ![]() |
33 | Chemical - early | Narrow stock - German sliver screws - table of atomic weights on back + 1 cursor window |
![]() ![]() |
37 | Electro | Top non-standard scale is for rapid calculation of tension losses in copper wires + bottom non-standard scale is for calculating peripheral velocities (D scale displaced by pi/6 or 0.5326) - table of conversion factors on back + 2 cursor windows |
![]() ![]() |
37 | Electro - early | Top non-standard scale is for rapid calculation of tension losses in copper wires + bottom non-standard scale is for calculating peripheral velocities (D scale displaced by pi/6 or 0.5326) + cm scale in well of stock + German silver screws - table of conversion factors on back + 2 cursor windows |
![]() ![]() |
37 | Electro - monochrome & early | Top non-standard scale is for rapid calculation of tension losses in copper wires + bottom non-standard scale is for calculating peripheral velocities (D scale displaced by pi/6 or 0.5326) + monochrome with no CI but cm scale in well of stock + German silver screws - table of conversion factors on back + 2 cursor windows |
![]() ![]() |
37/15 | Extra long Pocket Electro | Top non-standard scale is for rapid calculation of tension losses in copper wires + bottom non-standard scale is for calculating peripheral velocities (D scale displaced by pi/6 or 0.5326) + cm scale in well of stock - conversion tables on back + 2 cursor windows |
![]() ![]() |
37a | Desktop Electro | German silver screws + cm scale in well of stock + Table of constants on back |
![]() ![]() |
39 | Pocket Electro - Sytem Besser | 39 is one of the model no.‘s Nestler illogically reused for 2 totally different types + extremely unusual layout of scales (DBGM for Erwin Besser) + table of constants on back |
![]() ![]() |
4 | Enhanced Mannheim | Retailer’s name also in well |
|
40 | Retail & Monetary | Unusual incised scales + 1 cursor window in back |
![]() ![]() |
40 | Retail & Monetary - classic | German silver screws + table of conversion factors & 1 cursor window in back |
![]() ![]() |
40 | Retail & Monetary - early | Narrow stock & probably earliest model specifically made by any maker for commerce + German silver screws + 1 cursor window in back |
![]() ![]() |
40a | Desktop Retail & Monetary - late | Unusual scale layout + British pound sterling (£ s d) scales on back of slide + conversion tables on back |
![]() ![]() |
41 | Lilliput Enhanced Mannheim | cm & inch scale on back + 2 cursor windows |
|
42Z | Lilliput Mannheim | unnecessarily 2 cursor windows in back |
|
43 | Reinforced Concrete - System Hoffmann | Stress factors 1200 & 1400kg/cm2 of iron on either side of slide + table of factors on back & 2 cursor windows |
![]() ![]() |
45 | Desktop Basic long-scale | Largest of only 3 cylinder/drum models |
![]() ![]() |
5 | Mannheim | Table of conversion factors on back painted white |
|
7 | Business | Table of conversion factors printed on back - cheaper construction (e.g. no German silver screws) but still quality finish |
![]() ![]() |
8 | Rietz | Table of conversion factors on back painted white |
|
9 | Rietz | 2 cursor windows in back |
|
939 Hoehenwindmessung | Desktop Military Artillery Range Finding/Meteorology | Modern day 360 degree Winkel in Grad version of High Altitude Calculator for German Armed forces (NATO NSN No.: 6660-12-127-6307) for global missile trajectories or possibly jet stream & its effect on missiles or planes flying at high altitude + read more ... |
![]() ![]() |
A.B.C. | Military Tank Artillery | Special commission for L’arme blindée et cavalerie (ABC) or Armoured Cavalry Arm of French Army + 2 unnecessary cursor windows in back |
![]() ![]() |
ABC | Pocket Military Radiation | Specially commissioned fallout calculator for German Armed Forces (NATO NSN no.: 6665-12-136-1506) & ABC = Atomic, Biological & Chemical -- table on back lists battlefield fallout compensation/reduction factors + read more ... |
![]() ![]() |
ABL | Military Vehicle Logistics & Supply | Specially commissioned calculator for vehicles travelling in column formation made for the Belgian Army (ABL) but relationship to Westf. Versandhaus is unknown - Inch scale on back |
![]() ![]() |
GEA | Pocket Enhanced Mannheim | Specially commissioned by Bochum-based German supplier of air conditioning and refrigeration technology Gesellschaft für Entstaubungsanlagen (GEA AG) + railway track scales & German silver screws + table of constants & 2 cursor windows in back |
|
Glanzstoff | Pocket Textile | Specially commissioned by Vereinigte Glanzstoff-Fabriken AG + company name & logo’s on back + more textile constants + 2 cursor windows |
![]() ![]() |
Hermann Schubert | Pocket Textile | Specially commissioned by the Zittau-based leading German sewing thread supplier Herman Schubert + deceivingly nondescript Mannheim layout was later granted a German DRGM registered design (1454414) on 18-11-1938 because of the thread size table on back & later modified cursor |
![]() ![]() |
Landis & Gyr (11O) | Pocket Mannheim | Unmarked 11O special commission for Landis & Gyr A.G. - co. name printed on back with two unecessary cursor windows |
|
Landis & Gyr (11ZR) | Pocket Enhanced Mannheim | Unmarked 11ZR special commission for Landis & Gyr A.G. - co. name printed on back with two cursor windows |
|
Luftwaffenamt | Military Time-Speed-Distance for aircraft | Special commission for German Luftwaffenamt (Air Force) + German sliver screws - continuation of 1:30000000 top-edge scale in well + blind stamp in back indicates military provenance |
![]() ![]() |
RL 130 | Mannheim-like | Pre-engineered generic model made here for German Friedrich Krupp AG - back of the cursor innovatively doubles up as a clip for jacket or shirt pocket + read more ... |
![]() ![]() |
Sydema Corpometer | Bespoke Tailoring Aid | Special commission consisting of a 4-part ruler (one part missing) possibly for Wolterstorff to measure the size & shape of the female form for a made-to-measure jacket/coat |
![]() ![]() |
Sytem Rietz | Rietz | Special commission possibly for British maker/retailer A.G.Thornton but with a stock width associated more with a Mannheim type - table of constants on back + 1 cursor window. |
|
Total Stralenschutz | Pocket Radiation | Non-military ABC (Atomic, Biological & Chemical) fallout calculator specially made for German company: Total KG Foerstner & Co. |
![]() ![]() |
Norden | |||
Model | Type | Comments | Thumbnail |
(NoName) | Pocket Mannheim | NIFE (Swedish company set up by Georg Vogel to manufacture optical products) logo stamped on back - company name derived from battery components Nickel (Ni) and Iron (Fe) |
|
(NoName) | Pocket Rietz | Unusual layout of the scales |
![]() ![]() |
2/48 | Darmstadt | Appears well made |
![]() ![]() |
NORMA-Mechanik | |||
Model | Type | Comments | Thumbnail |
Gambrinus 100 | Pocket Beer Brewing | Gambrinus = European folklore entity & icon for beer & brewing - easier to use than contemporary beer brewing rules from F-C, Nestler, etc + company name & logo for “Ziemann Brauerei” on back |
![]() ![]() |
Grafia 100 | Pocket Basic Paper | Many paper/graphics gauge marks & industry specific factors such as datum marks for DIN sizes |
![]() ![]() |
Grafia 190 | Basic Paper | Hanging/floating cursor + many gauge marks + many paper/graphics industry specific factors such as datum marks for DIN sizes |
![]() ![]() |
Mekuria 190 | Business | Inner ring has many gauge marks for imperial-based conversions |
![]() ![]() |
Simplex 100 | Pocket Basic | Too basic to have the typical hanging/floating cursor + simple raised lug for moving inner disc |
|
Norwood Enterprises | |||
Model | Type | Comments | Thumbnail |
FPB-120 | Desktop Music Composition | Slide chart copyrighted design & trademarked DIAL-A-CHORD name |
![]() ![]() |
Oahu Publishing Co. | |||
Model | Type | Comments | Thumbnail |
Magic Music Guide | Music Guitar Chords | Slide chart with copyrighted design by John De Paul designed specifically for Hawain guitar |
![]() ![]() |
Oertling, Ludwig | |||
Model | Type | Comments | Thumbnail |
Excise 2611 | Alcohol Saccharometer set | Scales runs from 0 to 30 + 5 weights calibrated in steps of 30 from 1000 to 1120 but missing thermometer |
![]() ![]() |
OHICO | |||
Model | Type | Comments | Thumbnail |
Electro 15 | Electro | OEM version made by KHH (5 slits in well + 5 adjustment screws on botton side edge) but often mistaken as Dennert & Pape because of model no. - V & W scales in well of stock + conversion tables (in NL) on back - see also identical model sold by Ahrend & Kahn Frères |
|
Otto Meuter Rechenmaschinenfabrik | |||
Model | Type | Comments | Thumbnail |
PRODUX | Pocket Slide Adder - gold/black | Original version but being shorter adder bars are exposed when calculating + with no mechanical clear/reset function exposed adder bars are instead slid back up by pushing on a flat surface - e.g. a table top |
![]() ![]() |
PRODUX ST | Pocket Slide Adder - green | Being shorter adder bars are exposed when calculating + with no mechanical clear/reset function exposed adder bars are instead slid back up by pushing on a flat surface - e.g. a table top |
![]() ![]() |
Oxford University Press | |||
Model | Type | Comments | Thumbnail |
Musical Slide Rule | Book Music | Design of rule & book by tonal fanatic Llewelyn Southworth Lloyd (1876-1956) as introduction to fundamentals of musical scales & intervals - works in the same simple way as Oughtred’s original invention + shows & uses relationship between mathematics & music - slide rule in back |
![]() ![]() |
Pan American Band Int. Co. | |||
Model | Type | Comments | Thumbnail |
Simplex | Music Fingering for Flute and Piccolo | Slide chart copyrighted design published by American Mills Music Inc. |
![]() ![]() |
PENOL | |||
Model | Type | Comments | Thumbnail |
1005A | Rietz-like | Unusual & more convenient for a Rietz all scales on front face + Pen Ol(sen) was nickname for Danish founder Christian Olsen & reflects their primary product: fountain pens (incl. Parker's under licence) |
![]() ![]() |
102A | Enhanced Mannheim | Inch scale reverted + Pen Ol(sen) was nickname for Danish founder Christian Olsen & reflects their primary product: fountain pens (incl. Parker's under licence) |
![]() ![]() |
521A | Pocket Enhanced Mannheim two-tone without Trig scales | Pen Ol(sen) was nickname for Danish founder Christian Olsen & reflects their primary product: fountain pens (incl. Parker's under licence) |
|
Philips Electrical Ltd. | |||
Model | Type | Comments | Thumbnail |
Planned Lighting Calculator | Lighting | Used to calculate lighting costs & how to reduce them |
![]() ![]() |
Pickett & Eckel | |||
Model | Type | Comments | Thumbnail |
(NoName) | Fisher Universal Valve Sizing | Special commission copyrighted version made for Fisher Governor Co. + yellow but no ES suffix, logo = Triangle & artwork = 93 |
![]() ![]() |
108-ES | Pocket Rietz-like | OEM by SIC from their SINCO Rotorules range + ES = Eye-Saving, logo = Modern & all scales on back fixed |
![]() ![]() |
120 MICROLINE | Rietz (ver. 1) | Coloured yellow but without ES suffix + logo = Modern |
![]() ![]() |
200 | Pocketr Reitz | Specially commissioned by American manufacturer of batteries & lighting products National Carbon Company + logo = Triangle & artwork = 38 |
![]() ![]() |
22 | Pocket Building | Cheaper made Real Estate Costimator for rapidly calculating variety of costs related to owning & maintaining property + nomogram on slide & logo = Triangle |
![]() ![]() |
300 | Pocket Log-Log (ver. 2) | Coloured yellow but without ES suffix + logo = Triangle & artwork = 42 |
![]() ![]() |
500 | Log-Log | Early model made from magnesium & coloured yellow but no ES suffix + logo = Triangle & log-log scales = ortho-phase |
![]() ![]() |
520 | Photography | Specially commissioned as Type A-1 by US Air Force (USAF) for aerial work with scales on back read vertically & table of various conversion equivalents on white plastic strip stitched into the inside of the pouch + logo = Triangle & artwork = 58 |
![]() ![]() |
700 | Pocket Photography | Specially commissioned as Type A-2 by US Air Force (USAF) for aerial work with scales on back read vertically & table of various conversion equivalents on white plastic strip stitched into the inside of the pouch + logo = Triangle & artwork = 59 |
![]() ![]() |
Chords & Keys | Music Composition | Slide chart copyrighted design by Lynn T. Harris for organs, pianos & accordions - surprisingly made by manufacturer better known for its aluminium slide rules |
![]() ![]() |
N-500-ES | Log-Log | Copyrighted version with non-standard N- = Nylon cursor, ES = Eye-Saving + logo = Disk + artwork = 83 + known as (?) Hi Log-Log model |
![]() ![]() |
N-515-T | Eelctronic | Specially commissioned by American Cleveland Institute of Electronics + extensive tables & formulas, etc on back + N= Nylon cursor, T = Traditional white, logo = Disc & artwork = 349 |
![]() ![]() |
N1006-T | Pocket Technical | Earlier versions lacked Ln scale + N= Nylon cursor & T = Traditional white, logo = Disk & artwork = 80 |
![]() ![]() |
N1010-ES | Technical | Copyrighted version with N= Nylon cursor, ES = Eye-Saving + logo = Disk + artwork = 74 |
![]() ![]() |
N1010-T | Technical | Copyrighted version with N= Nylon cursor, T = Traditional white + logo = Disk + artwork = 74 |
![]() ![]() |
N1041-G | Fisher Universal Valve Sizing | Copyrighted version for Fisher Governor Co with N= Nylon cursor, G = Green & logo = Modern |
![]() ![]() |
N3-ES | Log-Log (ver. 4) | Extra wide copyrighted version with N= Nylon cursor, T = Traditional white + logo = Modern + log-log pairs = synchro scales & layout = Power Log Exponential |
![]() ![]() |
N600-ES | Pocket Log-Log | N= Nylon cursor & ES = Eye-Saving, logo = Disk & artwork = 81 + log-log pairs = synchro scales |
![]() ![]() |
N600-T | Pocket Log-Log | N= Nylon cursor, T = Traditional white, logo = Disk & artwork = 81 + log-log pairs = synchro scales |
![]() ![]() |
N7-T | Pipe Flow | Copyrighted design by S.P.L. Co. for Reynolds No.'s 2000-170000 + N= Nylon cursor, T = Traditional white, logo = Triangle & artwork = 91 |
![]() ![]() |
N808-T | Petroleum | For bunker fuels & only 8" model Pickett ever made + N= Nylon cursor, T = Traditional white + logo = Disk |
![]() ![]() |
N902-ES | Rietz (ver. 2) | N= Nylon cursor, ES = Eye-Saving, logo = Disk & artwork = 66 |
![]() ![]() |
N902-T | Rietz (ver. 2) | N= Nylon cursor, T = Traditional white & logo = Modern |
![]() ![]() |
PlantijnCasparie | |||
Model | Type | Comments | Thumbnail |
ECLIPS PLANISFEER | Desktop Astronomy - Northern Hemisphere | Slide chart designed as planisphere by Dutchman R. Walrecht to calculate star positions in Northern Hemisphere for given date & time but in a special eclipse of the sun (11/08/1999) edition showing positions of sun, moon, planets & perseids meteor storm + based on version made by ALRO |
![]() ![]() |
PLASTOGRAF | |||
Model | Type | Comments | Thumbnail |
Academica | Pocket Rietz | Almost certainly made by little known Brazilian maker but unusually instead San Paolo under company name it is Ind. Bros. - one open left-hand window with 1 hairline in back |
![]() ![]() |
Posterijen, Telegrafie en Telefonie (PTT) | |||
Model | Type | Comments | Thumbnail |
CWP 11 | Cable Radio | Well of stock & slide both shaped as isosceles trapeziums (CWP = centrale werkplaats/central workshop) + used to calculate signal loss in dB for a national cable radio broadcasting system offered to homes in The Netherlands from 1930 to 1970 - read more ... |
![]() ![]() |
Premia | |||
Model | Type | Comments | Thumbnail |
Quartz | Wristwatch Calculator Basic | Probably a CASIO or Citizen “lookalike” |
![]() ![]() |
Prometheus/Prometei/Prometejs - Leningrad | |||
Model | Type | Comments | Thumbnail |
Model 1 | Rietz - early | Prometheus = English version of Russian company names + hand-written serial no. = 7435 (also on back of slide) + nothing in well of stock = early model + conversion factors & formulas on back |
|
Refinery Supply Co. | |||
Model | Type | Comments | Thumbnail |
AC-ME Pocket Calculator | Petroleum Gas Flows for Orifice Meters | OEM by Nestler (style of Pi + MADE IN GERMANY on back) + AC-ME = Ac-curate Me-asuremet Precision Instruments (? designers) + version by Pickett & Eckel (1080-T) |
![]() ![]() |
Reiss | |||
Model | Type | Comments | Thumbnail |
(NoName ver. 1) | Artillery Range Finding | Maybe VEB MANTISSA made or transition model because of typical MANTISSA case & cursor |
![]() ![]() |
(NoName ver. 2) | Artillery Range Finding | Earlier (or later) ver. 1 is open frame & has a cm bevelled edge scale but no extra D scale on back of stock. | ![]() ![]() |
(NoName) | Artillery | For calculating the amount of charge needed/range in meters for various types of charge - has no slide! |
![]() ![]() |
(NoName) | Dummy | Showroom model (slide fixed) or possibly representatives sample |
|
(NoName) | Rietz | Costly “over engineered” construction to accommodate bevelled edge cm scale & supplementary mini-cursor | ![]() ![]() |
3212 | Pocket Enhanced Mannheim | Dutch Schut's Im-en Exporthandel printed on back + two small cursor windows |
|
3223 | Progress log-log | Progress type = refinement of two earlier Robert Reiss’ extended scale ideas - well-engineered slide rule with unusual scale layout |
![]() ![]() |
Reliable Typewriter & Adding Machine Corp. | |||
Model | Type | Comments | Thumbnail |
ADDOMETER | Dial Adder | Extended 8 dial design (no serial no.) for simple arithmetic & based on original Pascal adding machine. |
![]() ![]() |
ADDOMETER | Dial Adder Monetary | Serial no. 021501 & retailed by Tailors (UK) extended 8 dial design for pre-decimal calculations in British £sd & based on original Pascal adding machine. |
![]() ![]() |
Reliance Nameplates Ltd | |||
Model | Type | Comments | Thumbnail |
Rule Slide 10" | Enhanced Mannheim | top & bottom side edges reinforced with metal mesh - two windows, conversion table, helmeted head logo & UK government broad arrow mark on back |
![]() ![]() |
Ricoh / Relay Keisanjaku | |||
Model | Type | Comments | Thumbnail |
102 | Enhanced Mannheim | Metal backing plate + Table of constants & cursor window with 1 hairline in back |
|
120 | Darmstadt | Metal backing plate + Table of constants & cursor window with 1 hairline in back |
|
403 (Relay) | Lilliput Enhanced Mannheim | Metal backing plate + Table of constants & 1 cursor window with + 1 hairline in back |
|
403 (Ricoh) | Lilliput Enhanced Mannheim | Metal backing plate + Table of constants & 1 cursor window with + 1 hairline in back |
![]() ![]() |
505 (Relay) | Pocket Enhanced Mannheim | Table of conversion factor & 1 cursor window with 1 hairline in back |
|
505 (Ricoh) | Pocket Enhanced Mannheim | Table of conversion factor & 1 cursor window with 1 hairline in back |
|
80 | Mannheim | Metal backing plate |
|
Rijnja, P. | |||
Model | Type | Comments | Thumbnail |
Beams | Wooden Floor & Ceiling Beams - System Van Gerven | Tailor-made blank & cursor Hans Seehase but Rijnja added the scales - in this design Van Gerven included adjutment for beams bowing - table of building construction standard reference values in well of stock |
![]() ![]() |
Beams - basic | Pocket Wooden Floor & Ceiling beams - System Van Gerven | Tailor-made blank & cursor by Hans Seehase but Rijnja added the scales - table of building construction standard reference values on back |
![]() ![]() |
Concrete | Reinforced Concrete Floors - System J.L.H. Strackee poly-slide (2) | Tailor-made blanks supplied by Hans Seehase but Rijnja added the scales |
![]() ![]() |
RiSta (H.Stam) | |||
Model | Type | Comments | Thumbnail |
darmstadt 3 | Darmstadt | riSta = ri(chel)Sta(m) - OEM rule probably made by UTO - two cursor windows + hairline in back |
|
darmstadt 33 | Pocket Darmstadt | riSta = ri(chel)Sta(m) - OEM rule probably made by UTO - give-away from CONTROL DATA Corp - two cursor windows + hairline in back |
|
rietz 1 | Rietz | riSta = ri(chel)Sta(m) - OEM rule probably made by UTO |
|
rietz 11 | Pocket Rietz | riSta = ri(chel)Sta(m) - OEM rule probably made by UTO |
|
Robson & Co., F. | |||
Model | Type | Comments | Thumbnail |
(NoName) | Desktop Steel & Iron Weight Calculator - imperial | One of earliest weight calculators for rectangular & square section bars from little known UK (Newcastle on Tyne) instrument maker/optician |
![]() ![]() |
Rodgers, J.N. Ltd. | |||
Model | Type | Comments | Thumbnail |
Musician's | Music Composition & Transposer | Slide chart designed for constructing chords, transposition and general music theory |
![]() ![]() |
ROYAL | |||
Model | Type | Comments | Thumbnail |
1503 | School Darmstadt two-tone | OEM by Uchida - cm & 1/20 inch on back |
|
Rudolf Bauer & Co. | |||
Model | Type | Comments | Thumbnail |
Fedra | Log-Log | OEM model probably made East German VEB MANTISSA uncommonly is a closed-frame duplex model - i.e. back of slide just has Greek symbols & names for 1 to 20 for show + notch on top of right-had end to stop cursor falling off |
![]() ![]() |
Ruxton Multi-Vider Corp. | |||
Model | Type | Comments | Thumbnail |
Multi-Vider (Standard) | Pencil Basic | Mechanical drop-lead patented (FR670320) pencil incorporating an octagonal split-cylinder slide rule barrel |
![]() ![]() |
RUYI (Si Da Rule Factory) | |||
Model | Type | Comments | Thumbnail |
1015-1 | Log-Log Hyperbolic | Grey end braces |
![]() ![]() |
1083 | Log-Log Hyperbolic | Adjustable screws in metal end braces + similar to K&E 4083-3 |
![]() ![]() |
S.R.&S.E. (Slide Rule & Scale Eng. Co.) | |||
Model | Type | Comments | Thumbnail |
Koehring | Concrete Quantity Calculator | For calculating no. of batches need to concrete over a specific area when using particular models of Koehring & KwikMix pavers/mixers - design by G.L. Lockhart & copyrighted 1948 |
![]() ![]() |
REDI-MIX | Circular Construction CU.YD. / Concrete Calculator | Unusal duplex construction with two (front & back) closed frame slides - copyrighted design + patent applied for |
![]() ![]() |
Victor L. Phillips | Concrete Quantities and Areas | Calculator for computing imperial concrete quantaties & areas with company details on back - copyrighted design |
![]() ![]() |
W.H. Pipkorn | Brick & Tile | 1940 copyrighted design for determining bricks or tiles (also other masonary units) needed/used to build a wall of given dimensions (l x h) - tables on back show various types & sizes of masonry units + wastage |
![]() ![]() |
SANTOK / SANTOKU | |||
Model | Type | Comments | Thumbnail |
(NoName) | Pocket Rietz | Unbranded |
|
(NoName) | Technical two-tone | Unbranded apart from case |
|
93 | Pocket Enhanced Mannheim without Trig scales | ||
Schacht & Westerich | |||
Model | Type | Comments | Thumbnail |
2771 System Cuntz (ver. A) | Pocket Complex Number | Made by KHH - inch & cm scales on back - patented design (US1168059 & D.R.G.M. 536689) by Gregor Cuntz - sophisticated scale arrangement to keep the orders of magnitude of numbers in line that sadly failed in the market |
![]() ![]() |
Scientific Instruments Company (SIC) | |||
Model | Type | Comments | Thumbnail |
4030 | Lilliput Enhanced Mannheim | Serial No 30842 + Table of conversion factor & 1 cursor window with 1 hairline in back |
|
Scientific Publishing Co. | |||
Model | Type | Comments | Thumbnail |
Type T (2BT1) | Pocket-Watch Textile | Transition model as company name changes to Fowler - yellow lens face - two milled winders (one with crown ring) - table of weaving-related values on front face + table of weaving-related factors on back |
![]() ![]() |
Seehase, Dr. Ing. | |||
Model | Type | Comments | Thumbnail |
(NoName) | Pocket Mannheim | Model often used as a promotional gift/giveaway with a company name/logo on the back |
![]() ![]() |
Conversion | Pocket English and German Meaures | Incorporates 34 different imperial to metric conversion “gauge marks/factors | ![]() ![]() |
System Schirdewan | Textile | Used in a leading textile factory of the day Scherg (Brasov, Romania) + tables of constants on back - read more ... |
![]() ![]() |
Seger | |||
Model | Type | Comments | Thumbnail |
No. 52 | Darmstadt | Name “Seger” & “MADE IN NORWAY” blind stamped in well of stock + indistinct blind date-stamp on back = lookalike Norwegian-made copy of Faber-Castell 111/54? | |
Service Slide Rule Co. | |||
Model | Type | Comments | Thumbnail |
Electro | Log-Log | Although called an Electro layout does not fully meet the Bob Adams criteria for an electro type & PS gauge mark is wrong (746 = HP not PS) + table of conversion factors on back + 2 cursor windows - read more ... |
![]() ![]() |
Reed | Electronic Engineers | innovative gauge marks + D/L (Diameter to Length) Nagaoka coefficient scale in well + table of conversion factors & 2 cursor windows in back - read more ... |
![]() ![]() |
Servo Calculator Co. | |||
Model | Type | Comments | Thumbnail |
Boonshaft & Fuchs | Desktop Control Engineering | After preloading 11 of 25 removeable slides the chosen scale layout can "simply" calculate overall amplitude ratio & phase of a multiterm transfer function |
![]() ![]() |
SHUBB | |||
Model | Type | Comments | Thumbnail |
TG1 | Pocket Music Guitar Transposer | Slide chart for transposing chords & placing guide for a capo on guitar fingerboard + UPC 700682010013 or EAN 0700682010013 barcode numbers - still sold |
![]() ![]() |
SIMI | |||
Model | Type | Comments | Thumbnail |
154/47 | Darmstadt | Name “SIMI MALMÓ” & “MADE IN SWEDEN” printed in well of stock & on box = lookalike Swedish-made copy of Faber-Castell 1/54 (even the model numbering!) but not of the same quality | |
Smallwood, I & D (John & Daniel) | |||
Model | Type | Comments | Thumbnail |
(NoName) | Folding Shoe Size Stick - metric | For French shoe sizes 10-48 in increments of a Paris point (⅔ cm) + not only folding but when closed, heel rest & slinging toe marker lock the stick folded |
![]() ![]() |
SPZ - Voronezh | |||
Model | Type | Comments | Thumbnail |
NL-10m | Aviation | Flight Computer + identical model made by another Russian factory - LFAI |
![]() ![]() |
Staedtler-MARS | |||
Model | Type | Comments | Thumbnail |
544 28 | Log-log | OEM Nestler Multimath Duplex 0292 |
![]() ![]() |
544 A | Technical | Probably made by Fujj (F-100) - unusual choice of scales & layout common to Japanese makers - possibly retailed as a package with OHP version |
![]() ![]() |
544 A AV | Demonstration OHP Technical | Unusual choice of scales & layout - only other known examples are from Japanese makers - overhead projector version for model 544 A |
![]() ![]() |
Standardgraph | |||
Model | Type | Comments | Thumbnail |
900 | Basic/Conversion | clever interaction of conversion gauge marks & scales on front - table of conversion factors on back |
![]() ![]() |
Stanley Rule & Level Co. (USA) | |||
Model | Type | Comments | Thumbnail |
Carpenter Timber No. 12 | Joint 2-fold Old Arched-hinged Coggeshall | D Girt line = 4-40 + four-entry ¼ to INCH scale table on front + ¾-length E & M scales (split over 2 legs) on back |
![]() ![]() |
Carpenter Timber No. 46 | Joint 2-fold Large Plate-hinged Coggeshall | No D Girt line - unbranded but font & model numbering identical to Stanley (USA) but mysteriously only has B,C scales on front + ¾-length E & M scales (split over 2 legs) on back - or is it a later copy/forgery? |
![]() ![]() |
Stanley, W.F. (GB) | |||
Model | Type | Comments | Thumbnail |
(NoName) | Pocket Rectangular Protractor/Diagonal Scale - imperial | Early 0-360 degree model as address is Great Turnstile, Holborn. |
![]() ![]() |
Gooch | Desktop Gauge for Centering poly-slide (2) | Invented & patented (GB189313940 - 1894) by Charles Gooch as an impoved gauge for centering & mounting photographic prints et al - the 2nd slide is attached on top of the slide in the stock by means of a metal sleeve/clamp |
![]() ![]() |
M3613 Professor Fuller's Type 1 | Desktop helical long-scale | Patented (GB187801044 & US219246) design by George M. Fuller - serial No. 4869 with conversion tables, natural sines & Birmingham Wire Gauge on inner fixed cylinder |
![]() ![]() |
M3656 | Enhanced Mannheim | ||
M3686 | Electro | For Electrical or Mechanical Engineers - V & W scales in well of stock - table of conversion factors on back |
![]() ![]() |
M3689 | Student Mannheim | Cheaper version (celluloid facings only one front face) of M3656 - MADE IN ENGLAND and STANLEY LONDON stamped on slide |
![]() ![]() |
Pilot Balloon Mark II | Desktop Meteorology | Meteorological Office (MO) No. 1979/43 - possibly made for Stanley by J.J. Hicks or A.G. Thornton - adoption of standard rates of ascent removed need for Mark I poly-slide (2) but 4th cursor needed for “tail method” |
![]() ![]() |
Professor Fuller's Type 0 | Desktop helical long-scale - early production | A 48th Wedding Anniversary present from Ros - patented (GB187801044 & US219246) design by George M. Fuller - hand-held early shorter version with no spigot & no serial no. + conversion tables, natural sines & Birmingham Wire Gauge on inner fixed cylinder |
![]() ![]() |
W.H. Glaser | Desktop Textile Conversion poly-slide (2) | Unusual fixed cursor extending the range of a relatively short scale length - read more ... |
![]() ![]() |
Sterling Plastics (USA) | |||
Model | Type | Comments | Thumbnail |
(NoName) | Pocket Octal/Hexadecimal calculator for computer programmers | Based on 1973 American patent US3716186A (Kent B. Comfort) - promotional give-away for Environmental Dynamics Inc. (EDI) - read more … |
![]() ![]() |
556 Multiply-Ruler | Child's Teaching Aid/Calculator for Simple Arithmetic | Simple arithmetic slide calculator & pencil sharpener |
![]() ![]() |
584 | Enhanced Mannheim | Typical raised braces on back |
|
587 | Pocket Enhanced Mannheim | Typical raised moulded back of stock |
|
Dial-A-Matic | Dial Adder | Basic 4 dial design based on 1957 patent (US2797047) by Otto Springfield for simple arithmetic - read more … |
![]() ![]() |
Precision | Enhanced Mannheim | Typical raised braces & pillar supports part of the stock |
|
Stevens Engineering Co. | |||
Model | Type | Comments | Thumbnail |
Rally Indicator - model 25 | Time-Speed-Distance rallying calculator | California based maker specialising in rallying equipment, clocks, etc - road rallying tool popular in North America - long metal arm = “T” + 2 short metal arms = “E” & “M” - imperial/metric conversion table on back | ![]() ![]() |
Stichting Jazz Beheer Amsterdam | |||
Model | Type | Comments | Thumbnail |
Accoordenschuif | Music Chords | Post-WWII Amsterdamse Jazz Club was a nightspot for traditional jazz that later became a non-profit foundation for jazz-related projects as this educational slide chart for learning to improvise through choice of chords + developed by musician, game creator & foundation member Fred Hoorn + it was accompanied by a book & cassette of musical examples |
![]() ![]() |
Summira GmbH | |||
Model | Type | Comments | Thumbnail |
Summira 7 | Wheel Adder | Serial No.: 64284 with selection lever for simple addition or subtraction + black knob on side locks front reset paddle making “multiplication/division” (multiple adds/subtracts of same number) possible + company still operating in high-tech metal cutting & manufacturing |
![]() ![]() |
Sunrise - Moscow | |||
Model | Type | Comments | Thumbnail |
Krougovaia Logarifmioueskaia KL-1 | Pocket-Watch Basic | Model name = Circular logarithmic in Russian + black dotted winder for A & C scales wheras red dotted winder moves both pointers simultaneously |
![]() ![]() |
Systeem Matthijssen | |||
Model | Type | Comments | Thumbnail |
370 | Desktop Technical | Use/purpose of the many gauge marks is unknown - SR built into desktop stand for Nederlandse Kabelfabriek (NKF - Dutch cable factory in Delft) |
![]() ![]() |
386 | Desktop Technical | Possibly a basic model for other specially commissioned designs but use/purpose of the many gauge marks is unknown - SR built into desktop stand |
![]() ![]() |
412 | Desktop Transport | Commissioned by Coöperatieve Condensfabriek Friesland (CCF a Dutch dairy specialising in condensed milk) - for checking the waybills for shipping/tranporting goods |
![]() ![]() |
Tavernier-Gravet | |||
Model | Type | Comments | Thumbnail |
(NoName) | Desktop Pipe Flow - System Aisenstadt | Narrow body design by E.A. Aisenstadt & date stamped in back |
![]() ![]() |
(NoName) | Rietz | Left & right small window with cursor lines in back - paper table on back missing |
|
L. Mossé | Heating | L. Mossé was a leading French academic on heating |
![]() ![]() |
Technical Sales / Emblem | |||
Model | Type | Comments | Thumbnail |
1051 TUTOR | Technical two-tone | OEM by Uchida |
![]() ![]() |
1053 OLYMPIC LL | Darmstadt two-tone | OEM by Uchida - cm & 1/20 inch on back |
![]() ![]() |
1071 COMMERCIAL | Monetary two-tone | OEM by Uchida - £-s-d on back |
![]() ![]() |
1081 TECHLOG | Log-Log two-tone | OEM by Uchida |
![]() ![]() |
Tecnostyl | |||
Model | Type | Comments | Thumbnail |
41/R | Pocket Rietz | Promotional gift from office furniture supplier: ASPA |
|
Calcolator | Basic - early | Novel graduated ring of raised marks to aid lining-up/turning inner disc |
|
Calcolator | Basic - late | Novel graduated outer ring to aid lining-up/turning inner disc + gauge marks added to later more colourful version |
![]() ![]() |
TEKNOR | |||
Model | Type | Comments | Thumbnail |
1051 Grundskola | Technical | Swedish retailer selling an OEM by Japanese maker Ushida Yoko + unusual layout for entry or Elementary School model |
![]() ![]() |
1081 Gymnasium | Log Log | Swedish retailer selling an OEM by Japanese maker Ushida Yoko |
![]() ![]() |
525 | Pocket Mannheim | Swedish retailer selling an OEM probably by Danish maker UTO |
|
57/K | Pocket Rietz | Swedish retailer selling an OEM an OEM probably by Danish maker UTO + 1 cursor window in back |
|
Things of Science (Cambridge) Ltd. | |||
Model | Type | Comments | Thumbnail |
14 Slide Rule Kit | Boxed teaching aid | Part of a UK series of 40 do-it-yourself kits based on a post WWII programme & brainchild of American Watson Davis (1896-1967) to promote science education |
![]() ![]() |
Thomas Hart Ltd. | |||
Model | Type | Comments | Thumbnail |
Lambeth Horse Power Calculator | Speed | Promotional giveaway (possibly part of a series) for finding the HP needed for steam engines driving a line shafting set-up in a factory - design possibly by Pickworth - table on back for max HP for ropes of a given diameter/weight |
![]() ![]() |
Thomlinson, C.J. Ltd | |||
Model | Type | Comments | Thumbnail |
Equivalent Paper Slide Scale | "Pocket" Paper poly-slide (2) | Extensively used in paper making industry - uneven alignment of letters and numbers |
![]() ![]() |
Thornton A.G. / P.I.C. / British | |||
Model | Type | Comments | Thumbnail |
A.G. (NoName) | Desktop "prototype" | Unbranded but attributable to Thornton (horizontal/flat diamond box identification marks & reversed bottom edge scale) - traditional B scale replaced by upward pointing arrow - read more ... |
![]() ![]() |
A.G. (NoName) | Poly-slide (2) Steel Weight Calculator | Possibly made by D&P (Pi symbol) for naval steel shipbuilding where all weights in construction are recorded to calculate final displacement. |
![]() ![]() |
A.G. Clementson | Water Pipe Sizing | Bottom “duo” scale for pipe diameters according to Rietschel formula (in black) & according to Meier formula (in red) - table on back for friction equivalents in various fittings |
![]() ![]() |
A.G. D6957 | Improved Perry Log-Log | Made by Nestler (German silver screws + DRGM 164885 in well) with top edge 1/50ths inch scale for steam engine indicator diagrams, bottom rare Perry scale (0.91-10-4) patented (GB190123236) = reciprocal variant of LL (e-1) & Inch scale in well of stock + A.G. Thornton Manchester + conversion tables on back |
![]() ![]() |
A.G. English Electric | Lilliput A.C. Power Factor Electro | Specially commissioned by English Electric Co. + B1 & C1 Power Factor scales (A.J. Riches patent GB520442) on back of slide easily mistaken for reciprocal BI & CI scales - read more ... |
![]() ![]() |
British 0552/1448 | Naval Time-Speed-Distance calculator | Later version of model Pattern 1448 with identical scale layout & labelling but obviously without the UK government upward arrow mark |
![]() ![]() |
British AD 050 | School Differential Log-Log | Extra Thornton patented differential Trig scales ≡ to model P271 - superseded by model AD 150 |
![]() ![]() |
British AD 060 | Standard | ≡ to model P281 |
|
British AD 070 | Rietz | Rietz type without Trig scales |
![]() ![]() |
British AD 150 | Log-Log | Later replacement for model AD 050 |
![]() ![]() |
British P221 | Differential Comprehensive Log-Log | Extra Thornton patented differential Trig scales & Vector analysis scales - superseded by model AA 010 |
![]() ![]() |
British P271 | School Differential Log-Log | Extra Thornton patented differential Trig scales - superseded by model AD 050 |
|
British P281 | School Standard | superseded by model AD 060 |
|
PIC (NoName) | Pocket Mannheim | Advertising “give away” for High Duty Alloys Ltd, Slough, UK |
|
PIC 111/PC 8 | Differential Rietz | Rietz type without Trig scales but with extra Thornton patented differential Trig scales - conversion tables on back |
![]() ![]() |
PIC 112 | Desktop Differential Rietz | Rietz type without Trig scales but with extra Thornton patented differential Trig scales - conversion tables on back - “big brother” version of PIC 111 |
|
PIC 120 | Pocket Differential Log-Log | Extra Thornton patented differential Trig scales - “kid brother” version of PIC 121 |
|
PIC 121/PC 18 | Differential Log-Log | Extra Thornton patented differential Trig scales & Vector analysis scale - conversion tables on back |
![]() ![]() |
PIC 122 | Desktop Differential Log-Log | Extra Thornton patented differential Trig scales - conversion tables on back - "big brother" version of PIC 121 |
|
PIC 131 | Differential Electro | Extra Thornton mini Y & Z scales for financial calculations + patented differential Trig scales + Vector analysis scale - V & W scales in well of stock (metal well cursor) - conversion tables on back |
|
PIC 131/PC 18 | Differential Electro | Extra Thornton mini Y & Z scales for financial calculations + patented differential Trig scales + Vector analysis scale - V & W scales in well of stock (plastic well cursor) - conversion tables on back |
![]() ![]() |
PIC 132 | Desktop Differential Electro | Extra Thornton mini Y & Z scales for financial calculations + patented differential Trig scales + Vector analysis scale - V & W scales in well of stock (plastic well cursor) - conversion tables on back - “big brother” version of PIC 131 |
|
PIC 141 (Model E) | A.C. Electrical Electro | Designed for calculating with vector quantities - front face has Trig scales, rapid √squares of 2 numbers scale & temperature resistant (°C & °F) copper scales - angle to Log conversion scale on bottom edge - conversion tables on back + see also PIC 144 sibling |
![]() ![]() |
PIC 144 (Model F) | A.C. Electrical Electro | Designed for calculating with vector quantities - front face layout has Trig scales, rapid √squares of 2 numbers scale & temperature resistant (°C & °F) scales for Copper - Angle to Log conversion scale on bottom bevelled edge - conversion tables on back + see also PIC 141 sibling |
![]() ![]() |
PIC 221 | Differential Comprehensive Log-Log | Extra Thornton patented differential Trig scales & Vector analysis scales - superseded by models P221 & AA 010 |
|
PIC 241 | Differential Log-Log | Extra Thornton patented differential Trig scales - identical to model no. 271 |
|
PIC 271 | School Differential Log-Log | Specially commissioned by Lennig Chemicals Ltd. before relocating to Croydon, Surrey in 1968 + extra Thornton patented differential Trig scales - claim SR made from “high impact acrylic oroglas t” |
![]() ![]() |
PIC F 3649 | Log-Log | “F” model no. prefix = mahogany - mini resistance of copper wire scale for temperature variations on back of slide - conversion table on back |
![]() ![]() |
PIC F 3651 | Desktop Electrical & Mechanical Engineer Electro | V & W scales in well of stock - conversion tables on back of stock |
|
PIC F 3654 | Mannheim | Mini resistance of copper wire scale for temperature variations on back of slide - conversion tables on back |
|
PIC F 3658 | School Mannheim | wooden back |
|
PIC F 3756 | Desktop Mannheim | conversion tables on back |
|
PIC F 4865 | Engineer Commerce Electro | V & W scales in well of stock - mini Copper resistance scale on back of slide - conversion tables on back of stock |
![]() ![]() |
PIC Junior | School Mannheim | wooden back |
|
PIC P251 | Standard | “P” prefix = plastic - oddball PIC |
|
PIC Pattern 1435 | Naval Time-Speed-Distance calculator | Upward arrow preceding model no. on front face is UK government mark + all time related scales black & all speed/distance related scales red - identical front scale layout as Pattern 1448 sibling BUT missing Longitude (D.Long) scale on back of slide |
![]() ![]() |
PIC Pattern 1448 | Naval Time-Speed-Distance calculator | Upward arrow preceding model no. on front face is UK government mark + all time related scales black & all speed/distance related scales red BUT unlike Pattern 1435 sibling has a Longitude (D.Long) scale on back of slide for converting between degrees & nautical miles |
![]() ![]() |
PIC Rule Slide | Military Gunnery Royal Artillery | Extra gunnery gauge marks - typical 2 cursors (in case 1 gets lost!) for military version |
|
PIC Standard | Mannheim | Mini resistance of copper wire scale for temperature variations on back of slide - conversion tables on back |
|
PIC Standard Rule Slide | Mannheim Royal Artillery | trig formulae on the back + “R.A.” for Royal Artillery |
|
PIC VF 0123 | Mannheim Military | “VF” model prefix on back of stock = military - mini resistance of copper wire scale for temperature variations on back of slide - identical to standard Mannheim - conversion tables on back |
|
PIC VP114/PC 1 | Pocket Differential Rietz | VP prefix = Vest Pocket - Rietz but patented (GB411090) differential Trig scales - cm scale on back |
![]() ![]() |
Tiger Toys | |||
Model | Type | Comments | Thumbnail |
Durford | Demonstration Mannheim | Smaller of two models made & name comes from Durford Mill where the company was located + accurate for a demo rule having 4 spring-loaded tensioning metal balls in bottom slide track |
![]() ![]() |
Tombeur | |||
Model | Type | Comments | Thumbnail |
A2 | Advanced Juggler's - System Tombeur | Specialist/advanced rule for throwing patterns & juggling mechanics. Serial no. 004 blind-stamped in back. |
![]() ![]() |
Radix 2/10 | Desktop Log - System Leibniz | Decimal/10-bit binary (base/2/base 10) rule. Serial no. 019 blind-stamped in back |
![]() ![]() |
S3 | Pocket Simple Juggler's - System Tombeur | Simple rule for throwing patterns & juggling mechanics. Serial no. 011 blind-stamped in back. |
![]() ![]() |
Trascacco | |||
Model | Type | Comments | Thumbnail |
(NoName) | Music Guitar Chords | Slide chart designed by Gianluca Govoni - still sold |
![]() ![]() |
Trebb Sales | |||
Model | Type | Comments | Thumbnail |
Chord-O-Matic | Music Guitar Chords | Slide chart with registered designed specifically for Spanish (flamenco) guitar |
![]() ![]() |
Troeger (Hans) | |||
Model | Type | Comments | Thumbnail |
(NoName) | Desktop Pricing long-scale | Uncannily similar (visual & construction) to much earlier Swiss-made Lightning Calculator (Blitzrechner) of Ernst Billeter - extra % scale for discount &/or profit margin mark-up calculations - son of K. Emil Tröger who took over the company his father founded |
![]() ![]() |
Troeger (Karl Emil) | |||
Model | Type | Comments | Thumbnail |
Lung Volumes and Breathing | Desktop Medical long-scale | Standard values of AG Pathophysiologie d. Atmung - “1” in equilateral triangle = East German (DDR) post 1950 certification mark for “1st or good quality” - Karl Emil founded the company later taken over by son Hans - 8 mini specialist scales overlaid on D scale |
![]() ![]() |
Neues Deutschland (ND) | Desktop Typography printing - System B. Burghardt | Unmarked but obviously Karl Emil made - Neues Deutschland = East German daily newspaper - Cicero is a typographic unit of measure similar to a pica but with 15th century origins |
![]() ![]() |
No. 1 (ver. 37/393/6004) | Desktop Basic+ long-scale | “1” in equilateral triangle = East German (DDR) post 1950 certification mark for “1st or good quality” - Karl Emil founded the company later taken over by son Hans |
![]() ![]() |
No. 2 (Haefele) | Basic | For G. Haefele spinning & weaving mill - Karl Emil founded the company later taken over by son Hans but NOW operating out of same Kirchenthumbach address (see instructions) - Haefele mill now private car museum (Patina) |
![]() ![]() |
No. 2 (ver. 37/393/6004) | Basic | “1” in equilateral triangle = East German (DDR) post 1950 certification mark for “1st or good quality” - Karl Emil founded the company later taken over by son Hans |
![]() ![]() |
Trow, Isaac | |||
Model | Type | Comments | Thumbnail |
Routledge Engineer | Joint 2-fold Old Arched-hinged Coggeshall | D Girt line = 1-40 + “improved version” with gauge points & tables of engineering information on front + four-entry (split over 2 legs) INCH to ¼ scale table on back |
![]() ![]() |
TU - Kiev | |||
Model | Type | Comments | Thumbnail |
125-10m | Pocket Rietz | Equivalent ROCT (GOST) Russian State Standard No. = TY 25.01.610-72 |
|
250-10m | Rietz | ROCT (GOST) Russian State Standard No. = 5161-72 |
|
250-14m | Log-Log | ROCT (GOST) Russian State Standard No. = 5161-72 |
|
Uitgeversmaatschappij Interland | |||
Model | Type | Comments | Thumbnail |
Toonliniaal | Book Music do-it-self scales | Dutch language book by Anne Klein Geltink for calculating scales, chords & transposing major & minor chord combinations with a do-it-self scale transposition rule in back |
![]() ![]() |
Unique | |||
Model | Type | Comments | Thumbnail |
10G Legible | Mannheim | Self-defeating innovation: less “tick marks” + more labelling = legibility but also less accuracy + table of trig conversion factors on back - read more ... |
![]() ![]() |
10L/L Log Log | Log-Log | Table of decimal equivalents of fractions in well of stock & Trig tables on back |
|
10L/L Log Log | Log-Log - early | Early model made by Technical Supply Co - Trig tables on back |
![]() ![]() |
5G Legible | Pocket Mannheim | Self-defeating innovation: less “tick marks” + more labelling = legibility but also less accuracy + table of trig conversion factors on back - read more ... |
![]() ![]() |
5L/L Log Log | Pocket Log-Log | Log Log type unhyphenated + no CI scale - Trig tables on back |
|
5L/L Log Log | Pocket Log-Log - early | Early model made by Technical Supply Co - Trig tables on back |
![]() ![]() |
Area Calculator | Pocket Surface Areas - imperial | For calculating areas of 2-dimensional figures or shapes in imperial square yards or square feet - bottom scales 2 parts of a single folded scale (folded @ 6 sq. feet) |
![]() ![]() |
B Brighton | Darmstadt | Only Unique with Trig edge scales - despite unusual order of scales probably least unique Unique - table of decimal equivalents of fractions in well of stock & Trig formulas on back |
![]() ![]() |
C Commercial | Business | Unconventional rule for merchants working pre-decimal & in imperial - conversion tables on back |
![]() ![]() |
Caterers and Confectioners | Retail Cost & Portion Control | Unusually the majority of the scales are calibrated for pre-decimal British £sd – a non-decimal currency that does not directly lend itself to a logarithmic scale. |
![]() ![]() |
Concrete Volume Computer | Pocket Concrete | Made for Pioneer Concrete (UK) Ltd to calculate volume in cubic metres of concrete needed to fill conventionally shaped cavity (imperial or metric) - company name on back |
![]() ![]() |
Costing | Retail & Monetary | Copyrighted design for calculating (i) pre-decimal £-s-d & (ii) piece-rate pay - table of decimal equivalents of fractions in well of stock |
![]() ![]() |
Craft | Pocket Retail Costing | Despite the misleading model name a deceptively simple to use calculator for working in imperial feet & inches (l x w) of 2 dimensional areas + total pre-decimal cost for a given price/square foot for timber, sheet metal, hardwood, plywood, etc. |
![]() ![]() |
D Dualistic High-Speed (1) | Pocket Log-Log long-scale | Unusual mixture of long-scales & folded (√10) scales - table of Decimal Equivalent of Fractions in the well & tables of properties of materials on back - see bigger sibling |
![]() ![]() |
D Dualistic High-Speed (3) | Log-Log long-scale | Unusual mixture of long-scales & folded (√10) scales - table of Decimal Equivalent of Fractions in the well & table of properties of Trig Ratios on back - see smaller sibling |
![]() ![]() |
Double H | Log-Log - prototype | Only known duplex model by Unique - name possibly derived from the profile of aluminium end braces - nonstandard scale layouts - simplex cursors glued back-to-back |
![]() ![]() |
E Electrical | Electro - early | Unconventional layout (CF & DF & gauge points instead of W scale) - possibly made by Technical Supply Co. - Resistivity & Temperature Coefficient table on back |
![]() ![]() |
F Florida | Enhanced Mannheim | Extra narrow + imperial/metric conversion factors on back - model name possibly chosen for the US market - see smaller sibling |
![]() ![]() |
F.S. Ratcliffe Spring Calculating | Springs poly-slide (2) | For helical tension & compression spring calculations - upper slide for stress & load/lower slide for spring rate + two tables & graph on back |
![]() ![]() |
F5 Florida | Pocket Enhanced Mannheim | Extra narrow with no Trig scales- table of decimal equivalents of fractions in well of stock + trig ratios on back - model name possibly chosen for the US market - see larger sibling |
![]() ![]() |
Five-Ten | Pocket Mannheim long-scale | Double-length scales giving 10” precision - table of Trig ratios on back - see larger sibling |
![]() ![]() |
Friel-Sturdy Radiographic Exposure Calculator | Radiographic Exposure | For determining exposure times for medical X-rays - developed (prov. patent 29187/45) by two esteemed radiographers: Friel & Sturdy - table of conversion factors in well - table of bone densities (?) on back of slide - table of absorption values on back |
![]() ![]() |
Harfield Weight Calculator | Steel - George Mancell | Extra narrow & made for George Mancell (London) Ltd to calculate (imperial) total weight of steel bars (l x Lbs/ft) + tables of conversion factors & calculating aids on back |
![]() ![]() |
Harfield Weight Calculator | Steel - Harrison & Whitfield | Extra narrow & made for Harrison & Whitfield (Steel Stockbrokers) to calculate (imperial) total weight of steel bars (l x Lbs/ft) + tables of conversion factors & calculating aids on back |
![]() ![]() |
Interval Calculator | Calendar | For calculating # of days between two dates in a year - table of decimal equivalents of fractions in well - conversion tables on back for pre-decimal Shillings & Pence to decimal £'s + Cwts & Quarters to Tons |
![]() ![]() |
Jiffy | Lilliput Enhanced Mannheim without Trig scales | Unbranded - provenance of name possibly from “done in a jiffy” citation on cover of instructions - could be most cloned slide rule as many versions exist & UNIQUE was not known as an OEM supplier |
![]() ![]() |
M Monetary | Monetary | Stripped back version (fewer scales) of the Commercial - monetary scales (M1, M2 & M3) 3 parts of single folded scale (1d-£5000) – folded at 10/- & £50 - Table of decimal equivalents of fractions in well of stock |
![]() ![]() |
Mini-Mannheim | Lilliput Enhanced Mannheim without Trig scales | Parallel line logo | ![]() ![]() |
N Navigational | Enhanced Mannheim | Apart from linear edge scales for measuring distances on maps it has no specific air navigation-related scales but unconventionally has S & T scales on front face = ideal layout for general calculations - air & wind speed conversions factors on back |
![]() ![]() |
O Chemical | Chemical/Log-Log | Parallel line logo + overall longer & wider than standard Unique 10” model for chemical volumetric analytical calculations - tables of chemical atomic weights (A to Zr) in the well of the stock & a table atomic numbers for elements up to Nobelium on back |
![]() ![]() |
Percentage Butting | Metal Seams | Made for Metal Box Co. (MB) as in metal can production the overlap is a key integrity factor of the finished product - % butting = amount of overlap in imperial inches needed for a sound seam - another version was made by BH |
![]() ![]() |
Pioneer Long Scale | Desktop ?? long-scale | Extra wide (3¼") body with mysterious non-standard folded long-scales + 3 extra § scales in well & table of possible constants on back |
![]() ![]() |
Rolling Mill Calculator | Steel poly-slide (2) | Extra wide with nomogram in the centre for separating Force and Torque & made for Loewy Engineering Co. + based on 1973 UK patent GB659754 (Antolij Mogiljanskij) - company give-away to buyers of Loewy equipment |
![]() ![]() |
Rolling Mill Calculator | Steel poly-slide (2) - prototype | Extra wide with nomogram in the centre for separating Force and Torque & made for Loewy Engineering Co. + based on 1973 UK patent GB659754 (Antolij Mogiljanskij) - company give-away to buyers of Loewy equipment - given the style of text almost certainly a prototype version |
![]() ![]() |
Ten-Twenty | Mannheim long-scale | Double-length scales giving 20” precision - table of decimal equivalents of fractions in well of stock - various conversion tables on back - see smaller sibling |
![]() ![]() |
TER No.1 | Cabling | 1/5 set for calculating the Transmission Equivalent Resistance for 50 V. BALLAST in General Post Office (GPO) telephone cable design - overall longer & wider than standard 10” models - table of supplemental factors on back |
![]() ![]() |
TER No.2 | Cabling | 2/5 set for calculating the Transmission Equivalent Resistance for 50 V. NON-BALLAST and SIEMENS No. 16 in General Post Office (GPO) telephone cable design - overall longer & wider than standard 10” models - table of supplemental factors on back |
![]() ![]() |
TER No.3 | Cabling | 3/5 set for calculating the Transmission Equivalent Resistance for 40 V. C.B. in General Post Office (GPO) telephone cable design - overall longer & wider than standard 10” models - table of supplemental factors on back |
![]() ![]() |
TER No.4 | Cabling | 4/5 set for calculating the Transmission Equivalent Resistance for 22 V. C.B in General Post Office (GPO) telephone cable design - overall longer & wider than standard 10” models - table of supplemental factors on back |
![]() ![]() |
TER No.5 | Cabling | 5/5 set for calculating the Transmission Equivalent Resistance for all exchanges in General Post Office (GPO) telephone cable design - overall longer & wider than standard 10” models - table of supplemental factors on back |
![]() ![]() |
Tubemaking and Deep Drawing | Machining | Extra wide & made for Tube Investments Ltd for drawing sheet metal through a dye to create tubes - various conversion tables & aids on back |
![]() ![]() |
U1 Universal I | Log-Log | Universal I = Trig scales on stock - tables of conversion factor/densities of metals/densities of non-mtal materiels on back |
![]() ![]() |
U1 Universal One | Log-Log | Parallel lines logo - tables of conversion factors on back |
![]() ![]() |
U1/2 Universal I | Pocket Log-Log | Tables of conversion factors/densities of metals/densities of non-mtal materiels on back |
![]() ![]() |
U2 Universal II | Log-Log | Universal II = Trig scales on slide - Trig formulaes on back |
![]() ![]() |
Unique | Mannheim (type 2) - early | One of the earliest model’s - table of Trig values & formulas on back |
|
Universal | Log-Log | On all Log-Log models LU unconventionally = Log Upper (LL2) & LL = Log Lower (LL3) - incl. CI scale + tables of properties of materials on back |
![]() ![]() |
Wilkinson Sugar | Retail/Conversion | Unusually a slide rule specifically designed for Anglo-American pre-decimal commodity market & incorporating scales for 2 different currencies - table of decimal equivalents of fractions in well of stock |
![]() ![]() |
Unknown | |||
Model | Type | Comments | Thumbnail |
"Consul" The Educated Monkey | Replica Child's Teaching Aid/Calculator for simple arithmetic | Replica sold by ARITHMEUM - original Invented & patented (US1188490) by William Robertson in 1916 - “Consul” = name of famous performing monkey of the day - set x & ÷ problems with feet - results framed by monkey’s hands (+ & - problems need Addition Table card) |
![]() ![]() |
(NoName) | Alcohol Proof | Layout on back merely extends range from front |
|
(NoName) | Cheese making - System K. Von Henning | Possibly designed by Dutch poultry farmer & factory owner Karel von Henning (1896-1955) - helped Dutch cheese makers calculate optimum yield of cheese in Kg’s per 100L of milk - read more ... or try out here the online simulation created by Andries de Man |
![]() ![]() |
(NoName) | Desktop Gunter Rule | Invented by Edmund Gunter (1581-1626) - standard layout for a Gunter i.e. Diagonal scale on front face + full-length scales on back |
![]() ![]() |
(NoName) | Desktop Poly-slide (2) Steel Bars & Sections Weight Calculator - imperial | Wide-bodied model possibly made by BH |
![]() ![]() |
(NoName) | Desktop Steel Weight Calculator - imperial | Wide-bodied & well made but otherwise no clues as to the maker - scale layout identical to Robson model |
![]() ![]() |
(NoName) | Enhanced Mannheim | Japanese maker as JAPAN blind stamped in back of stock but blatant copy of Sterling Plastics, Inc. 589 Senior with red coloured scales on both sides of slide |
|
(NoName) | Gaugung Diagonal Line Rod | ½ inch square rod with brass shaven tip used to measure diagonally the approximate content of casks (max 240 gallons) of similar aspect ratios |
![]() ![]() |
(NoName) | Half Gunter Rule | Diagonal scale on front face + full-length scales on back but no A scale |
![]() ![]() |
(NoName) | Hatters Gauge | Probably made in continental Europe + unusually calibrated in metric & imperial - read more … |
![]() ![]() |
(NoName) | Lighting | Probably of Polish origin with table of factors/constants on back |
![]() ![]() |
(NoName) | Machining Time | German origin + outer scale = cutting speed mm/min, inner scale = diameter & spiral inner scale = main feed time per rev |
![]() ![]() |
(NoName) | Pocket Time-Speed-Distance Travel Calculator | Set average hourly speed against 1H arrow to show other travel distances/times + dating from style of Shell Pectin |
![]() ![]() |
1246 Gevaert Separation Control Chart | Colour Separation | Graphic arts control chart made for Belgium company Gevaert (better known as Agfa-Gevaert) for separating colours & black to white |
![]() ![]() |
1410 Planisphere | Desktop Astronomy - Northern Hemisphere | Slide chart to calculate star positions & star signs but apart from being German & having 1410 as a possible model number on the back, its provenance is a bit of an enigma |
![]() ![]() |
Atlas Copco | Pocket Pipe Flow - imperial | Specially commissioned by Atlas Copco - a Swedish company suppling industrial compressors, generators, pumps, etc. + table of correction factors for pipe bends on back - see also sibling metric model |
![]() ![]() |
Atlas Copco | Pocket Pipe Flow - metric | Specially commissioned by Atlas Copco - a Swedish company suppling industrial compressors, generators, pumps, etc. + table of correction factors for pipe bends on back - see also sibling imperial model |
![]() ![]() |
Atlas Copco | Pocket Pipe Flow for Compressed Air - metric & imperial | Specially commissioned from unknown Japanese maker by Atlas Copco - a Swedish company suppling industrial compressors, generators, pumps, etc. + table of correction factors for pipe bends on back - uncommonly dual metric & imperial calculator (black coloured scales for metric but red coloured scales for imperial) |
![]() ![]() |
B.F. Grizzle | Water Line Capacity | For calculating the friction loss in a section of pipe & head loss for a given pipe diameter, length & flow - layout based on Hazen–Williams equation - modern adaption of Lawrence-made model but with © renewed 1971 |
![]() ![]() |
Balkenschuif | Wooden Floor & Ceiling Beams | Designed by K. Schippers & made by in-house whilst working as building superintendent for Rotterdam city council for calculating size/weight of wooden beams - see also smaller version |
![]() ![]() |
BMI Calculator | Pocket Dietary | Mechanical calculator to determine (metric or imperial) an individuals Body Mass Index (BMI) based just on height & weight + automatically retracting tape measure part manages body fat based on the circumference of the waist. Read more … |
![]() ![]() |
Carpenter Timber | Joint 2-fold Large Plate-hinged Coggeshall | D Girt line = 4-40 + four-entry ¼ to INCH scale table on front + E & M scales (split over 2 legs) on back |
![]() ![]() |
Carpenter Timber | Pocket Joint 4-fold Old Arched-hinged Coggeshall | D Girt line = 4-40 + 12-24 “Pence per Load” table & eight-entry ¼ to INCH½ scale table (split over 2 legs) on front |
![]() ![]() |
Darnley's Rotable Lightning Calculator | Child's Multiplication Table Teaching Aid/Pencil Case | Invented & patented (GB167699) as a teaching aid for 1 - 20 multiplication tables by Percy Darnley & Barnett Richards in 1920 - possibly inspired by earlier 1885 German patent (DE33155) of Peter Wiesenmüller - dark-blue & green versions also made + German 4-colour series branded ROKA |
![]() ![]() |
Dieterle | Dancing | Slide chart based on registered design for German dance school Kurt und Marga Dieterle showing the basics needed for 8 different ballroom dancing styles + advert for various dancing classes on back |
![]() ![]() |
Easy-Keys! | Waistcoat Music Chord Indicator & Transposer | Slide chart copyrighted design by American Norton Gross + table chords & chord structure on back |
![]() ![]() |
Electroflo | Boiler Efficiency & Energy Costs | © design by H.W. Healy 1923 to optimise efficiency of commercial bopiels ((150-250 lbs/inch) + form & pinned construction suggests OEM rule by L&C Hardtmuth for London-based Electroflo Meters Co. |
![]() ![]() |
Ernst Gerber Heating Calculator | Heating requirements for rooms | ® design by Ir. Ernest Gerber but clearly values obtained were internationally accepted norms for commercial projects - “bible” for heating industry - many nomograms compliment complex layout |
![]() ![]() |
Everard | 4-sided Alcohol Gauging poly-slide(4) | Post 1824 because of Imperial based units/gauge marks + back of slide Face “A” = Divisors for various liquids + back of slide Face “B” = scales for correcting calculations for spheroid casks & other models + back of slide Face “C” = more Divisors + back of slide Face “D” = blank |
![]() ![]() |
Flexider Benelux | Pipe Expansion poly-slide (2) | Unusual patented design (? made by UK maker Blundell) with windows on both sides of stock revealing scales on 2 non-reversible slides + pictogram explaining formulas on back + Flexider Benelux b.v. was a NL company but is now part of Anamet Europe |
![]() ![]() |
Forcing Disc | Horticulture | Slide chart designed by Dutchman W. Granneman in 1975 to calculate how to alter/change flowering/harvesting time of tulip bulbs + can also be used for other perennials & other countries with different seasons + issued by Dutch International Flower Bulb Centre - see original by ALRO |
![]() ![]() |
HABS | Child's Multiplication Table Teaching Aid | German patented (D.R.P.) teaching aid for 1 - 20 multiplication tables - name HABS attributable to the German “Ich habe es” or “I have it” - Spanish “El Calculador” version also known to exist |
![]() ![]() |
II3-I05-0I-I3 | Music Guitar Chords | Russian slide chart with revolving wheel for choosing chords |
![]() ![]() |
MAGIC - BRAIN CALCULATOR | Slide Adder - silver/red | Although branded as from Japan possibly made by Hong Kong based Kingson - single adder design for both addition & subtraction - many, many similar looking OEM versions sold |
![]() ![]() |
Merchants Calculator | Retail | 1946 © Sears, Roebuck and Co. dual purpose design: (i) top 3 scales for staple & seasonal requirements & (ii) bottom 4 scales for % mark up, mark on, cost & selling prices + scale groups cannot be used in conjunction |
![]() ![]() |
MERK-o-GRAAF MERKENZOEKER | Business | Slide chart from defunct Dutch marketing company Van der Graaf & Co. to help compose a trademark or brand name + company slogan = your brand is your silent salesman - read more (in Dutch) ... |
![]() ![]() |
Miraccord | Music Guitar | Slide chart for choosing guitar chords |
![]() ![]() |
Noel-Bentley | Desktop Paper Roll Computor poly-slide (2) | Robert Noel-Bentley design (patent CA489176 - 1952) for calculating (pre-shipment) physical characteristics of commercially manufactured large & heavy rolls of paper - possibly made by Blundell. |
![]() ![]() |
Orgelbau-Fachverlag | Desktop Music Organ Pipes - System Rensch | Made for specialist German music publisher Orgelbau-Fachverlag for scaling organ pipes (wood metal flues & reeds) but a follow-on cheaper & thinner version of original limited high-quality Laukhuff Orgelpfeifen model by F-C + Table of frequencies on back |
![]() ![]() |
Orgelpfeifenmensuren-Rechenstab (ver. 2) | Music Organ Pipes | Copyrighted design by Dr. Wolfgang Adelung (1920–1994) using Töpfer's index for scaling organ pipes - Adelung was a well-known German organist who published many books related to building & playing of organs + "simpler" predecessor to limited high-quality Laukhuff Orgelpfeifen model by F-C |
![]() ![]() |
Petit & Fritsen (ver. F) | Music Carillons | Specially commissioned slide chart by Dutch bell foundry (still operating) Petit & Fritsen + designed by Hien Fritsen to help carillonneurs choose optimum set-up of bells (tones) for carillons of 1-46 bells + on back a table to calculate strength of housing needed for a given bell weight when being rung - see also GB & NL versions |
|
Petit & Fritsen (ver. GB) | Music Carillons | Specially commissioned slide chart by Dutch bell foundry (still operating) Petit & Fritsen + designed by Hien Fritsen to help carillonneurs choose optimum set-up of bells (tones) for carillons of 1-46 bells + on back a table to calculate strength of housing needed for a given bell weight when being rung - see also NL & F versions |
![]() ![]() |
Petit & Fritsen (ver. NL) | Music Carillons | Specially commissioned slide chart by Dutch bell foundry (still operating) Petit & Fritsen + designed by Hien Fritsen to help carillonneurs choose optimum set-up of bells (tones) for carillons of 1-46 bells + on back a table to calculate strength of housing needed for a given bell weight when being rung - see also GB & F versions |
|
RG-44 | Demonstration Military Artillery Range Finding - System Grigorovich | Made for NVA 266 & 256 = German Nationale Volksarmee Infantry Division - instruction model for field version of RG-44 |
![]() ![]() |
Sikkens Blind Color | Colour Blending | Slide chart made for Dutch paint company Sikkens (now part of Akzo-Nobel) for ensuring blends/combinations of basic Dutch standard NEN colours are “colour blindness proof” |
![]() ![]() |
Slide Rule of Music | Music Chord Indicator & Transposer poly-slide(3) | Designed & copyrighted by American musician Henry E. Pendleton |
![]() ![]() |
Smarty Cat | Child's Teaching Aid/Calculator for Simple Arithmetic - early | Based on a 1953 Spanish patent (ES38332) by Cándido - snappy model name comes from cat face on both sides of cursor (line-up windows = eyes + mouth) + cat paw mark impressions on ends of stock (front & back) - 1 side for simple arithmetic + other side for multiplication - later version with multi-coloured bands on stock |
![]() ![]() |
Smarty Cat/Skole-Regnestok | Child's Teaching Aid/Calculator for Simple Arithmetic | Multi-coloured version based on a 1953 Spanish patent (ES38332) by Cándido - snappy model name comes from cat face (line-up windows = eyes + mouth) + cat paw mark impressions on ends of stock on the original - 1 side for simple arithmetic + other side for multiplication |
![]() ![]() |
Total Stralenschutz | Pocket Radiation | Non-military ABC (Atomic, Biological & Chemical) fallout calculator specially made by possibly NORMA or CONTROLLER for German company: Total KG Foerstner & Co. - see also Nestler made version |
![]() ![]() |
Twaddell | Strength of liquids | For calculating acidity or sweetness of liquids + slide much longer than stock + see Hezzanith Hydrometer for taking measurements in Twaddell’s - read more ... |
![]() ![]() |
VISCALEX | Pocket Petroleum Pipes | Specially commissioned by Mulhouse-based engineering company Société Alsacienne de Constructions Mecaniques with French patented design for calculating pressure drop in petroleum/fuel pipes or conduits + company name & table of constants on back |
![]() ![]() |
Viskositaets-Temperature Kalkulator | Viscosity-Temperature Calculator | Made for German chemical specialities Schwegmann (still in business) but maker unknown + general viscosity calculator for liquids according to various norms e.g. Engler, Gardner-Holdt, etc |
![]() ![]() |
кнп-57 | Aviation poly-slide(2) | Russian-made flight computer equivalent to classic Dalton designed American E6-B |
![]() ![]() |
US Navy Hydrographic Office | |||
Model | Type | Comments | Thumbnail |
2102-C Rude Star Identifier | Desktop Astronomy - Northern & Southern Hemispheres | Slide chart A-N Type 1 for aeronautical use based on an original design by Gilbert T. Rude but later modified by Elmer Collins + set consists of a double-sided white base plate (side for each hemisphere) & 6 transparent plastic overlays |
![]() ![]() |
Van Oosterhout, A. | |||
Model | Type | Comments | Thumbnail |
(NoName) | Desktop Replica Gunter Rule | Invented by Edmund Gunter (1581-1626) - replica made by KRING member Ton van Oosterhout - standard layout for a Gunter i.e. Diagonal scale on front face + full-length scales on back |
![]() ![]() |
Napier Bones | Replica Calculating Rods | Invented by Scot John Napier (1550-1617) replica set made by KRING member Ton van Oosterhoutset consisting of 1 multiplier rod + 10 multiplication table rods + 1 larger squares & cubes rod |
![]() ![]() |
VEB Fuellhalterfabrik MAKEBA | |||
Model | Type | Comments | Thumbnail |
Makeba-Kombinator | Pencil Mannheim | Mechanical drop-lead pencil incorporating a crude slide rule as part of the barrel |
![]() ![]() |
VEB MANTISSA | |||
Model | Type | Comments | Thumbnail |
1731 523/4 | Wallet Darmstadt | Given quality finish probably special commission by military |
![]() ![]() |
1802 | Climate, Dew Point & humidity | Made for Feutron Klimasimulation GmbH for calculating with a max atmospheric pressure of 760 Torr |
![]() ![]() |
Multi | Pocket log-log | Company logo top right-hand corner |
![]() ![]() |
Véma Drukwerk bv | |||
Model | Type | Comments | Thumbnail |
Akkoorden-Vinder | Music Chords | Slide chart for any instrument for finding 9 most popular chords for 17 different tones + sibling Table D'Accords green version in French also issued |
![]() ![]() |
Venetsianos (Panagiotis) | |||
Model | Type | Comments | Thumbnail |
Dr. Haro | Logarithms of numbers | CD version ingeniously made by Pano of a 1887 concept invented by Dr. Haro, a French army medical officer, that probably never went into production see also online simulation by Andries de Man |
![]() ![]() |
W.H. Harling | |||
Model | Type | Comments | Thumbnail |
702 | Desktop Enhanced Mannheim - early | No makers name or logo - catalogued by Colin Barnes as “Lloyds Register Slide Rule” - table of constants on back |
|
Waltman Jr., J. | |||
Model | Type | Comments | Thumbnail |
Balkenschuifje | Lilliput Wooden Floor & Ceiling Beams | Designed by K. Schippers for rapidly calculating size/weight of wooden beam needed to conform to Amsterdam or Rotterdam building regulations - see also larger version |
|
Weems & Plath Inc. | |||
Model | Type | Comments | Thumbnail |
Nautical Slide Rule | Naval Time-Speed-Distance calculator | Unbranded special commission for US Navy (N00104-68-M=QH70-1969) & notably layout is almost identical to item (105) still being sold + naval heritage from imperial sea miles outermost scale |
![]() ![]() |
West & Partners, A. | |||
Model | Type | Comments | Thumbnail |
Glider | Rietz | Possibly made by John Davis & Son - Glider name from slide-long slotted metal patented (GB232037 - L.E. Edwards) tensioning spring for “automatic” smooth sliding - steel back + paper table of conversion factors |
![]() ![]() |
White & Gillespie (W&G) | |||
Model | Type | Comments | Thumbnail |
432 | Electro Dualface Comprehensive | Highly innovative thumb-wheel cursor for extra cursor positioning accuracy |
![]() ![]() |
476 | Dualface Trigonometrical/Stadia | Very unusual scale layout incl. Exsec-Versine & Arc-Chord |
![]() ![]() |
William Langley | |||
Model | Type | Comments | Thumbnail |
Carpenter Timber | Desktop Coggeshall | Rare duplex Coggeshall with 4–40 GIRT LINE for volumes of round timber + 2 sets of brass gauge pins (marked 0,16, 8 & 8,16, 0 respectfully) for round, 8 or 16 sided timber + INVERTED LINE (AI scale) for volumes of rectangular timber - compared to Dring & Fage version layout front & back reversed |
![]() ![]() |
Wizard Werke GmbH | |||
Model | Type | Comments | Thumbnail |
CALCULATING MACHINE | Slide Adder - silver/black | Single adder design both addition & subtraction |
![]() ![]() |
WK-Wohnen | |||
Model | Type | Comments | Thumbnail |
Farbschieber | Colour combinations for Interior Designers poly-slide (3) | Developed in cooperation with German Institute for Colour Psychology - all 3 slides & inside top/bottom edges of cursor “tongue and grooved” - all slides interchangeable & reversible - read more ... |
![]() ![]() |
Wolters-Noordhoff | |||
Model | Type | Comments | Thumbnail |
112 | Technical two-tone | OEM by FUJI for Dutch retailer WOLTERS-NOORDHOFF + cm on back |
![]() ![]() |
1200 (ver. 2) | Darmstadt-like two-tone | OEM by FUJI for Dutch retailer WOLTERS-NOORDHOFF |
![]() ![]() |
87 | Rietz two-tone | OEM by FUJI for Dutch retailer WOLTERS-NOORDHOFF |
![]() ![]() |
FJ 102 | Technical two-tone | OEM by FUJI for Dutch retailer WOLTERS-NOORDHOFF + cm scale on back |
![]() ![]() |
JE 650 | Technical two-tone | OEM probably by Faber-Castell for Dutch retailer WOLTERS-NOORDHOFF & strikingly similar to F-C 52/81 |
![]() ![]() |