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Details and Image
Type
Model No.
Maker
Country
Construction
Material
Date
Scale Length
Area of Use
Pocket Watch Slide Rules
M&P / Cercle à 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.
Image 1
Image 2
Image 3
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Image 6
