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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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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: differential

Maker	Model	Type	Material	Comments	Thumbnail
Thornton A.G. / P.I.C. / British	British AD 050	School Differential Log-Log	plastic	Extra Thornton patented differential Trig scales ≡ to model P271 - superseded by model AD 150
Thornton A.G. / P.I.C. / British	British P221	Differential Comprehensive Log-Log	plastic	Extra Thornton patented differential Trig scales & Vector analysis scales - superseded by model AA 010
Thornton A.G. / P.I.C. / British	British P271	School Differential Log-Log	plastic	Extra Thornton patented differential Trig scales - superseded by model AD 050
Thornton A.G. / P.I.C. / British	PIC 111/PC 8	Differential Rietz	wood/celluloid veneers	Rietz type without Trig scales but with extra Thornton patented differential Trig scales - conversion tables on back
Thornton A.G. / P.I.C. / British	PIC 112	Desktop Differential Rietz	wood/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. / British	PIC 120	Pocket Differential Log-Log	wood/celluloid veneers	Extra Thornton patented differential Trig scales - “kid brother” version of PIC 121
Thornton A.G. / P.I.C. / British	PIC 121/PC 18	Differential Log-Log	wood/celluloid veneers	Extra Thornton patented differential Trig scales & Vector analysis scale - conversion tables on back
Thornton A.G. / P.I.C. / British	PIC 122	Desktop Differential Log-Log	wood/celluloid veneers	Extra Thornton patented differential Trig scales - conversion tables on back - "big brother" version of PIC 121
Thornton A.G. / P.I.C. / British	PIC 131	Differential Electro	wood/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 (metal well cursor) - conversion tables on back
Thornton A.G. / P.I.C. / British	PIC 131/PC 18	Differential Electro	wood/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
Thornton A.G. / P.I.C. / British	PIC 132	Desktop Differential Electro	wood/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. / British	PIC 221	Differential Comprehensive Log-Log	plastic	Extra Thornton patented differential Trig scales & Vector analysis scales - superseded by models P221 & AA 010
Thornton A.G. / P.I.C. / British	PIC 241	Differential Log-Log	plastic	Extra Thornton patented differential Trig scales - identical to model no. 271
Thornton A.G. / P.I.C. / British	PIC 271	School Differential Log-Log	plastic	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”
Thornton A.G. / P.I.C. / British	PIC VP114/PC 1	Pocket Differential Rietz	plastic	VP prefix = Vest Pocket - Rietz but patented (GB411090) differential Trig scales - cm scale on back