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Details and Image
Type
Model No.
Maker
Country
Construction
Material
Date
Scale Length
Area of Use
Pocket Watch Slide Rules
Stanley / Boucher Calculator Type 2
W.F. Stanley (GB)
UK
Metal/glass/paper
c1900
Ø 5.2 cm
Basic Calculations
Notes:
Patented in 1876 it was the first pocket-watch style slide rule but had many makers. It is uncertain if this duplex model with two crown knobs and the additional rev-counter pointer on the back was made or just retailed by Stanley.
Image 1
Image 2
Image 3
Image 4
