Archive of Collections



Details and Image



TypeModel No.MakerCountryConstruction
Material
DateScale LengthArea of Use
Pocket Watch Slide Rules
M&P / Cercle Calcul Type 2
Meyratt & Perdrizet
France
Metal/glass/paper
c1900
Ø 5.7 cm
Basic Calculations

Notes: 1880 patented design with a rarer true pocket-watch type 1 sibling that included a watch movement within the outer ring of scales.


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