• 455 Martinson, Los Angeles
  • 8 (043) 567 - 89 - 30
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  • ARISTO 90117 specially commissioned Aqua-Math for calculating the water content of tobacco leaves
  • 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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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: DARGUE Bros. Ltd. / Simplon
ModelTypeMaterialCommentsThumbnail
Bilateral Log-Log - early wood/paper covered by clear plastic

“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 ...

Dargue Brothers Ltd / Simplon Bilateral Log-Log
S.B. 5 Bilateral Pocket Enhanced Mannheim - early wood/paper covered by clear plastic

“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 ...

Dargue Brothers Ltd / Simplon S.B. 5 Bilateral Pocket Enhanced Mannheim
S.B.10 Bilateral Log-Log wood/paper covered by clear plastic

“Half-duplex” layout with scales on back of closed frame stock & dual cursor tracks for reversing cursor - read more ...

Dargue Brothers Ltd / Simplon S.B.10 Bilateral Log-Log
S.E.10 (Bilateral) Electro wood/paper covered by clear plastic

“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 ...

Dargue Brothers Ltd / Simplon S.E.10 (Bilateral) Electro
S.M.10 Major (Bilateral) Log-Log wood/paper covered by clear plastic

“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 ...

Dargue Brothers Ltd / Simplon S.M.10 Major (Bilateral) Log-Log
S.P. 5 Primary Pocket Mannheim wood/paper covered by clear plastic

Pocket version of S.P.10 but without LL & CI scales - extensive table of conversion factors on back - read more ...

Dargue Brothers Ltd / Simplon S.P. 5 Primary Pocket Mannheim
S.P.10 Primary Log-Log wood/paper covered by clear plastic

Extensive table of conversion factors on back - read more ...

Dargue Brothers Ltd / Simplon S.P.10 Primary Log-Log
S.R.10 Bilateral Rietz wood/paper covered by clear plastic

Later “Half-duplex” layout with scales on back of closed frame stock & extra wide single track for reversing cursor - read more ...

Dargue Brothers Ltd / Simplon S.R.10 Rietz
SR-2 Pocket Mannheim plastic/bakelite

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 ...

Dargue Brothers Ltd / Simplon SR-2 Pocket Mannheim
SR-3 Pocket Uniface Technical plastic/bakelite

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 ...

Dargue Brothers Ltd / Simplon SR-3 Pocket Uniface Technical
SR-5 Uniface Technical plastic/bakelite

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 ...

Dargue Brothers Ltd / Simplon SR-5 Uniface Technical
SR-6 Enhanced Mannheim plastic/bakelite

Unusual dirty orange colour plastic = form of bakelite - slide not reversible but 2 windows in the back & aluminium strengthening strip - read more ...

DARGUE Brothers Ltd / Simplon SR-6 Enhanced Mannheim
WR-6 Standard Enhanced Mannheim wood/celluloid facings

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 ...

Dargue Brothers Ltd / Simplon WR-6 Standard Enhanced Mannheim
WR1-A Selecta Mannheim wood/celluloid veneers

Plain white celluloid faced slide & back - 1 of 5 WR models with higher quality finish & higher retail price - read more ...

Dargue Brothers Ltd / Simplon WR1-A Selecta Mannheim
XL-10 (Bilateral) Log-Log wood/paper covered by clear plastic

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 ...  

Dargue Brothers Ltd / Simplon XL-10 (Bilateral) Log-Log