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Details and Image
Type
Model No.
Maker
Country
Construction
Material
Date
Scale Length
Area of Use
Pocket Watch Slide Rules
Small / The Small Pocket Calculator Type 1
Small & Company
USA
Metal/porcelain/paper
c1920
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
Image 2
Image 3
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Image 6
Image 7
Image 8
