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Details and Image
Type
Model No.
Maker
Country
Construction
Material
Date
Scale Length
Area of Use
Pocket Watch Slide Rules
Waddington / Lord's Calculator Type 1
Richard Waddington
UK
Metal/glass/paper
??
Ø 6.8 cm
Basic Calculations
Notes:
Design based on 2nd 1903 patent and is the 1st of four versions from three other makers or retailers. Unlike other pocket-watch types this calculator has no index pointer or hairline on the glass.
Image 1
Image 2
Image 3
Image 4
Image 5
