• 455 Martinson, Los Angeles
  • 8 (043) 567 - 89 - 30
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  • ARISTO 90107 specially commissioned model for calculating the lifespan of filament lightbulbs
  • Koch, Huxhold & Hannemann (KHH) - made the 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

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Interested in finding out more out about such calculating wonders? Then try one of the slide rule related articles (often light-hearted) I have published.
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Search results: Click on any Model listed in the leftmost column (or its image) for the full specification OR hover over its "Thumbnail" image (if shown) for a pop-up enlargement

You searched for: LOGA Calculator A.G.
ModelTypeMaterialCommentsThumbnail
15m (ver. E) Desktop Basic long-scale metal/paper

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

LOGA 15m (ver. E) Desktop Basic long-scale
2.4m (ver. E) Desktop Basic long-scale - yellow metal/paper

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

LOGA 2.4m (ver. E) Desktop Basic long-scale - yellow
30E (ver. 2) Basic metal/paper

Model suffix “E” = Einfach/elementary - budget 3-spoke metal backplate - see also bigger sibling

LOGA 30E (ver. 2) Basic
30RC (ver. 2) Business metal/paper

Serial No. 65 + model suffix “R” = with reciprocal scale & “C” = commercial + turning lever - try out here the online simulation created by Andries de Man

LOGA 30RC (ver. 2) Business
30RZh Retail/Conversion metal/paper

Serial No. 0289 + model suffix “R” = with reciprocal scale, “Z” = extra Zins/interest scale & “h” = with turning lever - see also bigger sibling

LOGA 30RZh Retail/Conversion
30sR (ver. 2) Basic+ aluminium/paper

​Model suffix “s” = lightweight construction & “R” = with reciprocal scale + back anodised brass colour & serrated/knurled edge to disc

LOGA 30sR (ver. 2) Basic+
30sT (ver. 1) Technical metal/paper

Model suffix “s” = lightweight construction & “T” = Technisch/technical scales + budget 3-spoke metal backplate - see also bigger sibling

LOGA 30sT Technical
30Tt/360º Technical metal/paper

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

LOGA 30Tt/360º Technical
30Tt/360º Technical - early metal/paper

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

LOGA 30Tt/360º Technical - early
7.5m (ver. E) Desktop Basic long-scale - white metal/paper

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

LOGA 7.5m (ver. E) Desktop Basic long-scale - white
75 Praezision 6400 A 0/00 Desktop 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 75 Praezision 6400 A 0/00 Desktop Military Artillery/Stadia Topography
75E Desktop Basic long-scale aluminium/paper/bakelite

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

LOGA 75E Desktop Basic
75EA Desktop Basic/Monetary/Conversion long-scale aluminium/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 75EA Desktop Basic/Monetary/Conversion
75RZ (ver. 2) Desktop Retail/Conversion long-scale aluminium/paper/bakelite

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

LOGA 75RZ Desktop Retail/Conversion
75T Desktop Technical long-scale aluminium/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

LOGA 75T Desktop Technical long-scale
K150d Pocket Technical/Business Rietz-like aliminium/cardboard

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

LOGA K150d Pocket Technical/Business Rietz-like
K300d Technical/Business aliminium/cardboard

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

LOGA K300d Technical/Business
Topo 6400 A 0/00 (ver. 2) Military Artillery/Stadia Topography - early metal/paper

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

LOGA Topo 6400 A 0/00 (ver. 2) Military Artillery/Stadia Topography
Topo 6400 A 0/00 (ver. 3) Military Artillery/Stadia Topography metal/paper

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

LOGA Topo 6400 A 0/00 (ver. 3) Military Artillery/Stadia Topography
Wetter (30E) Basic metal/paper

Specially commissioned 30E for advertising by Zurich-based Wetter - budget 3-spoke metal backplate

LOGA Wetter (30E) Basic