• 455 Martinson, Los Angeles
  • 8 (043) 567 - 89 - 30
  • support@email.com
  • Koch, Huxhold & Hannemann (KHH) - made surprising System Korte slide rule that does addition & subtraction
  • Smallwood Folding Shoe Sizing Stick in metric for French shoe sizes 10-48 in increments of a Paris point (⅔ cm)
  • Lawrence MIT Antenna slide rule for radar antenna performance was classified during WWII by UK & US governments
  • ALRO-made ruler unusually with a cursor for analysing ECG printouts of the cardiac Sinus Rhythms
  • Hatters Gauge - for measuring the size of a hat but unusually calibrated in metric & imperial
  • Glovers Rule - for measuring the length of a glove in imperial inches
  • Unusual non-logarithmic QR 41 military model by Dennert & Pape (D&P) for training anti-aircraft gunners
  • Colour combinations slide rule made by German WH-Wohnen for Interior Designers
  • Professor Fuller’s Drum Calculator from 1878 - made by W.F. Stanley
  • Modern wristwatch with slide rule bezel calculator made by German maker Kienzle
  • Ruxton made Multi-Vider combined drop-lead pencil & slide rule
  • Rare Otis King Model N for Retail & Monetary with white scales (422 & 424) on a black background
  • Darnley’s Rotable Lightning Calculator/Pencil Case calculating aid
  • Makeba made Kombinator combination pencil & slide rule
  • Rare Carbic-made Fischer Calculator slide rule
  • Specialist slide rule for a national home cable radio broadcasting system offered in The Netherlands from 1930 to1970
  • Smallest drum (≈ 2.4m) made by renowned Swiss maker LOGA

Search my slide rule collection

Search by maker

Search by keyword

Tip: separate keywords (implict AND) by a space or a comma and if needed, limit the search by adding keywords proceeded by a hyphen: e.g. -Faber, -plastic. Phrases in quotes may also be used.

Search my tech papers

Interested in finding out more about this calculating wonder? Then try one of the related articles (often light-hearted) I have published.
Go to the search my tech papers page.

Search results: Click on any Maker listed in the leftmost column for that model's full specification OR hover over its "Thumbnail" (if shown) for a pop-up enlargement of the image

You searched for: desktop
MakerModelTypeMaterialCommentsThumbnail
A.W. Faber380Desktop Enhanced Mannheimwood/celluloid veneers

Gold lettering + cm scale in well of stock - INCHES to METER printed conversion scale on back

A.W. Faber-Castell3/11Desktop Structural Engineeringwood/celluloid veneers

special tables on back

A.W. Faber-Castell3/31Desktop Reinforced Concretewood/celluloid veneers

Nomogram on slide and scales in well of stock

A.W. Faber-Castell342 (ver. 2)Desktop Columbus Business long-scale - System Rohrberg Wood/celluloid veneers

Co-branded (box & rule) with KLAWUN + 1st F-C specialist rule for Merchants - extra wide body

A.W. Faber-Castell385NDesktop Rietzwood/celluloid veneers

Popular desktop model + table on constants & 2 cursor windows in back ​

A.W. Faber-Castell4/22Desktop Businesswood/celluloid veneers

Cursor not shown in image - conversion table on back

A.W. Faber-Castell4/38Desktop Stadia Topography - 360gwood/celluloid veneers
A.W. Faber-Castell4/54Desktop Darmstadt - earlywood/celluloid veneersConversion tables & factors on back
A.W. Faber-Castell4/54Desktop Darmstadtwood/celluloid veneers

No blind date stamp - coversion tables & factors on a plastic book-mark

A.W. Faber-Castell4/60Desktop Enhanced Mannheimwood/celluloid veneers

6 slide tension adjustment screws in bottom edge + table of conversion factors on back with 2 cursor windows

A.W. Faber-Castell4/87Desktop Rietzwood/celluloid veneers
A.W. Faber-Castell4/92/382Desktop Log-Logwood/celluloid veneers

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

A.W. Faber-Castell4/98Desktop Electrowood/celluloid veneers

V & W scales in well of stock

A.W. Faber-Castell44/87Desktop Rietzlaminated wood/celluloid veneers

Part of unusual limited series made from high pressure laminated (HPL) wood with metal inserts - patent no. DE892693

A.W. Faber-CastellHeine RealzeitscheibeDesktop Network Planningplastic

Specially commissioned by Georg Heine, Stuttgart + front disc doubles as erasable notepad

A.W. Faber-CastellLaukhuff OrgelpfeifenDesktop Music Organ Pipes - System Renschthick plastic

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

ALRO (All-Round)400 D (AC-1.nn)Desktop Darmstadtmetal/paper/plastic

See also smaller sibling - conversion table of fractions also on back 

ALRO (All-Round)500 N (AC-1.nn)Desktop Basicplastic/metal/paper

N = Normaal (normal) + personally enhanced (lighter plastic outer baseplate & peripheral cursor hairlines) model of last ALRO Technical Director Han Wanders - see also smaller sibling 

ALRO (All-Round)KLIMAATKONTRAKT (AC-2.19)Desktop Energy Savingplastic

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) 

ALRO (All-Round)Klinische Rekencirkel (AC-1.39)Desktop Medical - System Lipsmetal/paper

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 

ALRO (All-Round)KLM SYST ALRO - System van Roon (AC-1.35)Desktop Aviationmetal/paper

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 

ALRO (All-Round)PHILIPS DATA SYSTEMS (AC-3.11)Desktop Electronics for computer programmersplastic/metal

Slide chart made for Dutch electronic multinational Philips with © design for their P300 bookkeeping minicomputer showing available functions according memory sectors A to S

ALRO (All-Round)PLANISFEER (AC-6.05)Desktop Astronomy - Northern Hemisphereplastic/card

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 

ALRO (All-Round)SYNRES (AC-2.23)Desktop Paint Conversionplastic

​Slide chart converting viscosity values between various standardised units + SYRES = Dutch company (still operating) specialising in commercial coatings & resins for buildings, boats, cars, etc 

Aristo01068 Studio Desktop Technical/Log-Logplastic

Extra wide ​- 25cm (no. 0968) & 12.5cm (no. 868) versions also made

Aristo01070 MultiLog Desktop Technical/Log-Logplastic

Extra wide ​- Multilog v/s Studio = extra LL00 & LL0 scales - 25cm (no. 0970) & 12.5cm (no. 870) versions also made

Aristo1055Desktop Commerz I Businessplastic

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 ​

Aristo1067 U (D&P)Desktop Darmstadtplastic

Co-branded D&P name in well of stock - ​inch scale on back

Aristo1067 UDesktop Darmstadtplastic

​inch scale on back

Aristo109 (D&P)Desktop Rietzplastic

Co-branded D&P name in well of stock​

Aristo30050 Lindell "55"Desktop Transversal Planimetermetal/plastic

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

Aristo60126 RADAR-WINDDesktop Military Artillery Range Finding/Meteorologyplastic/metal

Modern day mit Strichteilung version (inner scales calibrated in more military favoured 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 or planes flying at high altitude

AstroCartEise Eisinga PlanetariumDesktop Astronomy - Northern Hemispherecard

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  

Billeter, Julius & ErnstW 4Desktop long-scalemetal/wood/paper

Missing chrome turning knob - based on drum-based design patented in 1894 (US513172) & tradition of drum-type Swiss makers  

Billeter, Julius & ErnstW 10Desktop Basic long-scale metal/paper
Blundell Brothers/Rules Ltd. (BRL)T.20 Technicians Desktop Log-LogBakelite/PVC (Astralon) facings

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 ...

Casella, L.P.(NoName)Desktop "prototype"wood/celluloid veneers

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 ...

Color Wheel Company3459 Watercolor WheelDesktop Colour Mixing - earlycard

Slide chart (still sold) designed to assist artists in mixing watercolours & to achieve colour harmonies

David Chandler Co.The Night SkyDesktop Astronomy - Southern Hemisphereplastic

Slide chart to calculate star positions & star signs for given date & time + designed to be read at night

Dennert & Pape (D&P)GWRDesktop Military Naval Artilleryplastic

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

Dennert & Pape (D&P)IVDesktop Enhanced Mannheimwood/celluloid veneers

IV = model with 4 adjustment screws in bottom edge - railway track scales - cm scale in well of stock​

Dennert & Pape (D&P)QR 41Desktop Military Artillery Squaringplastic

QR = “Quadrat-Rechenschieber” - commissioned by “Gebr. Wichmann” (stamp in well) - probably classroom training aid for anti-aircraft gunners - 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

Dietzgen1752P ManiphaseDesktop Rietz-likewood/celluloid veneers

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 

Dietzgen1797A AtlasDesktop Business long-scale - Type IIImetal/enamelled

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” 

Dring & FageCarpenter TimberDesktop Coggeshallwood/brass

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

Dring & FageCustoms & Exercise D-F-52Desktop Alcohol Gauging Head Rodwood/brass

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

Dring & FageMark VI Desktop Artillery for Indirect Firealuminium/nickel silver

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) ​

Dring & Fage(NoName)Desktop Alcohol Gaugingwood/brass

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

DUVAL, Roger(NoName)Desktop Rietzplastic

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

Farmar, F.C.Wine & Spirit Merchants RuleDesktop Standard for Wine & Spirit Tradewood/ivorine verneers/brass bindings

Trade rule calculating over/under proof alcohol, gauging, blending, stocktaking, discount & profit + later Gloucester Terrace address = possibly made by Lucas

Gebr. Wichmann1919RDesktop Rietzwood/celluloid veneers

OEM by Nestler - cm scale in well of stock + hand-written list of formulas on back

Geo. W. RichardsonSlide Rule Model of 1917Desktop Artillery Range Findingbrass/wood/celluloid veneers

Robust military grade OEM for J. H. Weil & Co. - Trig scales are in Mils (6400 mils = 360 degrees)​

Graphoplex6245Desktop Electro Log-Logplastic

Two closed windows with cursor line in back + see also pocket 643 sibling

Graphoplex6250Desktop Rietzplastic

​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

Graphoplex643Pocket Electro Log-Logplastic

Name of NL company Ingersoll-Rand in well of stock - one open window right with 1 hairline in back = see also desktop 6245 sibling

GraphoplexDYNSTAT Desktop Impact Testingplastic

DYNSTAT is a mechanical impact/resilience testing method popular in Germany (DIN 53435) for testing small samples of plastic ​

Hemmi275Desktop Hyperlog Electro (ver 1)bamboo/celluloid veneers

Desktop version of 25cm model 255 - ​§ scales on front face for converting degrees into radians & vice-versa - supposedly for Advanced Electrical Engineers.

Hemmi279Desktop Expert Mechanical Engineerbamboo/celluloid veneers

metal end braces - desktop version of 259​

Hemmi70Desktop Improved Rietzbamboo/celluloid veneers

Branded in well but no discernable model no. + table of conversion factors on back - also sold as Tamaya 4480 

Hicks J.J.Pilot Balloon Mark IDesktop Meteorology poly-slide (2)wood/celluloid veneers

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.

J. A. Nicholl & Co.Mark VI Desktop Artillery for Indirect Firealuminium/nickel silver

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

John Davis & Son (Derby) LtdDemocratDesktop Mannheim with Trig scaleswood/celluloid veneers

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

John Davis & Son (Derby) LtdDurocratDesktop Mannhiemwood/celluloid veneers

Unmarked - cm scale extension + 6 slits in well of stock - L scale reversed

Keuffel & Esser (K&E)4051Desktop Enhanced Mannheimwood/celluloid veneers

Serial no. 322 + 5 adjustment screws & conversion table on back

Keuffel & Esser (K&E)4080-5Desktop Decitrig Log-Logwood/celluloid veneers/metal straps

Serial no. 445698

Keuffel & Esser (K&E)4081-5Desktop Decitrig Log-Logwood/celluloid veneers/metal straps

Serial no. 902506

Keuffel & Esser (K&E)N-4053-5 Desktop Polyphase Enhanced Mannheimwood/celluloid veneers

N prefix for new version + serial no. 740727 + 5 adjustment screws & conversion table on back

Keuffel & Esser (K&E)N-4088-5Desktop Polyphase Technicalwood/celluloid veneers/metal straps

N prefix = new/modified version + serial no.: 235840​

Keuffel & Esser (K&E)N-4096Desktop Merchants' Businesswood/celluloid veneers

N prefix for new 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!

Keuffel & Esser (K&E)N-4101 Desktop Stadia Topography - 360gwood/celluloid veneers

N prefix for new version + serial no. 106473 + 5 adjustment screws & conversion table on back

Keuffel & Esser (K&E)4012 (type 2) Thacher's Calculating Instrument Desktop Basic long-scalemetal/wood/paper

​Special anniversary gift from Ros - serial no. = 1685

Keuffel & Esser (K&E)Short Base TriangulationDesktop Military Artillery Range Findingwood/painted

Specially produced chunky model with a Mannheim-like layout based on Mils - read more ...

Klawun, Joe1001 Ü (F-C 44/22)Desktop Businesswood/celluloid veneers

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

Koch, Huxhold & Hannemann (KHH)1050Desktop Rietzwood/celluloid veneers

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​

Leningrad Factory(NoName)Desktop Military Artillery Range Findingwood+metal/celluloid veneers

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(NoName)Desktop Rietzwood/celluloid veneers

ROCT (GOST) Russian State Standard No. = 5161-57 + conversion factors & formulas on back​

LOGA Calculator A.G.15m (ver. E)Desktop Basic long-scalemetal/paper

Serial No. 155202 (“15” correlates to scale length & “5202” = no.) + version “E” = Einfach/elementary

LOGA Calculator A.G.2.4m (ver. E)Desktop Basic long-scale - yellowmetal/paper

Serial No. 2237 (possibly correlates to overall scale length) + version “E” = Einfach/elementary

LOGA Calculator A.G.7.5m (ver. E)Desktop Basic long-scale - whitemetal/paper

Serial No. 751030 (“75” correlates to scale length & “1030” = no.) + version “E” = Einfach/elementary

LOGA Calculator A.G.75 Praezision 6400 A 0/00Desktop Military Artillery/Stadia Topography aluminium/paper/bakelite

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

LOGA Calculator A.G.75EDesktop Basic long-scalealuminium/paper/bakelite

Model suffix “E” = Einfach/elementary - see also smaller sibling - try out here the online simulation created by Andries de Man

LOGA Calculator A.G.75EADesktop Basic/Monetary/Conversion long-scalealuminium/paper/bakelite

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

LOGA Calculator A.G.75RZ (ver. 2)Desktop Retail/Conversion long-scalealuminium/paper/bakelite

Serial No. 4100 + model suffix “R” = with reciprocal scale & “Z” = extra Zins/interest scale - see also smaller sibling

LOGA Calculator A.G.75TDesktop Technical long-scalealuminium/paper/bakelite

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

LOGAREX4542-27501Desktop Rietz-likeplastic

​Interesting & useable layout of scales

Systeem Matthijssen370Desktop Technicalwood/paper

Use/purpose of the many gauge marks is unknown - SR built into desktop stand for Nederlandse Kabelfabriek (NKF - Dutch cable factory in Delft)

Systeem Matthijssen386Desktop Technicalwood/paper

Possibly a basic model for other specially commissioned designs but use/purpose of the many gauge marks is unknown - SR built into desktop stand

Systeem Matthijssen412Desktop Transportwood/paper

​Commissioned by Coöperatieve Condensfabriek Friesland (CCF a Dutch dairy specialising in condensed milk) - for checking the waybills for shipping/tranporting goods   

National Rechenwalze, A.G.10Desktop Basic long-scalemetal/paper

serial no. = 3545 with knurled metal turning knob - stand allows drum to be locked vertically to save desktop space

Nestler(NoName)Desktop Militarywood/celluloid veneers

​Both non-standard scales folded & apart from NESTLER name in well no other markings

Nestler0215Desktop Darmstadt 360°wood/celluloid veneers

tables of conversion factors on back

Nestler0235Desktop Rietzwood/celluloid veneers

tables of conversion factors on back

Nestler0275Desktop Technical long-scalewood/celluloid veneers

Tables of conversion factors + 2 cursor windows in back - long scales (folded @ Pi) & desktop model meant accuracy of 0.03% + smaller sibling 0270

Nestler0375Desktop Electrowood/celluloid veneers

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

Nestler18Desktop Enhanced Mannheimwood/celluloid veneers

cm scale in well of stock + tables of conversion factors on back

Nestler21aDesktop Darmstadt 360°wood/celluloid veneers

cm scale in well of stock + table of conversion factors on back

Nestler23a (A/R)Desktop Rietz - latewood/celluloid veneers

Unusual scale length​ - tables of conversion factors on back

Nestler24Desktop Rietzwood/celluloid veneers

cm scale in well of stock + tables of conversion factors on back - ex Shell (B.P.M.)

Nestler24bExtra long Desktop Rietz long-scalewood/celluloid veneers

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 ....​

Nestler24RDesktop Rietz - latewood/celluloid veneers

cm scale in well of stock + tables of conversion factors on back

Nestler24R/1Extra long Desktop Rietz long-scalewood/celluloid veneers

Not demonstration type but 1 of only 4 engine-divided 100cm models (only maker capable of engine dividing desktops >50cm)​

Nestler27aDesktop Technical long-scalewood/celluloid veneers

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 

Nestler28aDesktop Stadia Universal Topography - 400gwood/celluloid veneers

Tables of conversion factors on back - model later replaced by 0286 Geometer + see smaller sibling

Nestler37aDesktop Electrowood/celluloid veneers

German silver screws + cm scale in well of stock + Table of constants on back

Nestler40aDesktop Retail & Monetary - latewood/celluloid veneers

Unusual scale layout + British pound sterling (£ s d) scales on back of slide + conversion tables on back

Nestler45Desktop Basic long-scalemetal/paper

Largest of only 3 cylinder/drum models

Nestler939 HoehenwindmessungDesktop Military Artillery Range Finding/Meteorologyplastic/metal

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 ...

Norwood EnterprisesFPB-120Desktop Music Compositioncard

Slide chart copyrighted design & trademarked DIAL-A-CHORD name

PlantijnCasparieECLIPS PLANISFEERDesktop Astronomy - Northern Hemisphereplastic/card

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

Robson & Co., F.(NoName)Desktop Steel & Iron Weight Calculator - imperialboxwood

One of earliest weight calculators for rectangular & square section bars from little known UK (Newcastle on Tyne) instrument maker/optician 

Servo Calculator Co.Boonshaft & FuchsDesktop Control Engineeringmetal/plastic

After preloading 11 of 25 removeable slides the chosen scale layout can "simply" calculate overall amplitude ratio & phase of a multiterm transfer function

Stanley, W.F. (GB)GoochDesktop Gauge for Centering poly-slide (2)wood/metal

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 ​

Stanley, W.F. (GB)M3613 Professor Fuller's Type 1Desktop helical long-scale brass/mahogany

Patented (GB187801044 & US219246) design by George M. Fuller - serial No. 4869 with conversion tables, natural sines & Birmingham Wire Gauge on inner fixed cylinder

Stanley, W.F. (GB)Pilot Balloon Mark IIDesktop Meteorologywood/celluloid veneers

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”

Stanley, W.F. (GB)Professor Fuller's Type 0Desktop helical long-scale - early productionsteel/brass/mahogany

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

Stanley, W.F. (GB)W.H. GlaserDesktop Textile Conversion poly-slide (2)wood

Unusual fixed cursor extending the range of a relatively short scale length - read more ...

Tavernier-Gravet(NoName)Desktop Pipe Flow - System Aisenstadtwood/celluloid veneers

​Narrow body design by E.A. Aisenstadt & date stamped in back

Thornton A.G. / P.I.C. / BritishA.G. (NoName)Desktop "prototype"wood/celluloid veneer

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 ...

Thornton A.G. / P.I.C. / BritishPIC 112Desktop Differential Rietzwood/celluloid veneers

Rietz type without Trig scales but with extra Thornton patented differential Trig scales - conversion tables on back - “big brother” version of PIC 111

Thornton A.G. / P.I.C. / BritishPIC 122Desktop Differential Log-Logwood/celluloid veneers

Extra Thornton patented differential Trig scales - conversion tables on back - "big brother" version of PIC 121

Thornton A.G. / P.I.C. / BritishPIC 132Desktop Differential Electrowood/celluloid veneers

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

Thornton A.G. / P.I.C. / BritishPIC F 3651Desktop Electrical & Mechanical Engineer Electrowood/celluloid veneers

V & W scales in well of stock - conversion tables on back of stock

Thornton A.G. / P.I.C. / BritishPIC F 3756Desktop Mannheimwood/celluloid veneers

conversion tables on back

TombeurRadix 2/10Desktop Log - System Leibnizmahogany/paper + perspex

Decimal/10-bit binary (base/2/base 10) rule. Serial no. 019 blind-stamped in back

Troeger (Hans)(NoName)Desktop Pricing long-scalecardboard/plastic

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)Lung Volumes and BreathingDesktop Medical long-scalecardboard/wood

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

Troeger (Karl Emil)Neues Deutschland (ND)Desktop Typography printing - System B. Burghardtcardboard/wood

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

Troeger (Karl Emil)No. 1 (ver. 37/393/6004) Desktop Basic+ long-scalecardboard/wood

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

UniquePioneer Long ScaleDesktop ?? long-scalewood/paper coated with plastic laminate

Extra wide (3¼") ​body with mysterious non-standard  folded long-scales + 3 extra § scales in well & table of possible constants on back

Unknown1410 PlanisphereDesktop Astronomy - Northern Hemisphereplastic

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

UnknownNoel-BentleyDesktop Paper Roll Computor poly-slide (2)plastic

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.

Unknown(NoName)Desktop Gunter Rulewood incised/brass pins

Invented by Edmund Gunter (1581-1626) - standard layout for a Gunter i.e. ​Diagonal scale on front face + full-length scales on back

Unknown(NoName)Desktop Steel Weight Calculator - imperialwood/printed paper

Wide-bodied & well made but otherwise no clues as to the maker​ - scale layout identical to Robson model

Unknown(NoName)Desktop Poly-slide (2) Steel Bars & Sections Weight Calculator - imperialthick plastic

Wide-bodied model possibly made by BH ​

UnknownOrgelbau-Fachverlag Desktop Music Organ Pipes - System Renschthin plastic

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

US Navy Hydrographic Office2102-C Rude Star IdentifierDesktop Astronomy - Northern & Southern Hemispheresplastic

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.(NoName)Desktop Replica Gunter Rulewood incised

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

W.H. Harling702Desktop Enhanced Mannheim - earlywood/celluloid verneers

No makers name or logo - catalogued by Colin Barnes as “Lloyds Register Slide Rule” - table of constants on back

William LangleyCarpenter TimberDesktop Coggeshallwood/brass

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