Archive of Collections

Details and Image

TypeModel No.MakerCountryConstruction
DateScale LengthArea of Use
Pocket Watch Slide Rules
Small / The Small Pocket Calculator Type 1
Small & Company
Ø 5 cm
General Calculations

Notes: 1st of two versions based on a patent for a similar device filed in 1900 by Roger W. Conant. Strictly speaking is a circular rather than pocket watch type of slide rule.

Image 1

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Image 8