Archive of Collections

Details and Image

TypeModel No.MakerCountryConstruction
DateScale LengthArea of Use
Pocket Watch Slide Rules
Stanley / Boucher Calculator Type 1
W.F. Stanley (GB)
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 was made or just retailed by Stanley.

Image 1

Image 2

Image 3

Image 4

Image 5

Image 6

Image 7