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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

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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: Fowler

Model	Type	Material	Comments	Thumbnail
Junior (4MJRG1)	Pocket Concentric long-scale	metal & plastic	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	pressed metal/plastic	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	chrome & plastic	Two milled winders - many gauge marks around outermost/peripheral ring - plain black back
Twelve-Ten (3MG2)	Pocket-Watch Business - early	chrome/bakelite/plastic	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	pressed chromel/plastic	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	pressed metal/plastic	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	Metal/glass	Early pre Fowler + prominent axle & two (1 ringed) crown winders & replaced by Fowler's Type M - tables on back