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Details and Image
Type
Model No.
Maker
Country
Construction
Material
Date
Scale Length
Area of Use
Pocket Watch Slide Rules
Fowler / Twelve-Ten
Fowler
UK
Steel/plastic/paper
c1936
Ø 8.6 cm
Surveying
Notes:
With an all-steel back this version is the 2nd of three model variants. Notably the C scale is divided into tenths and the two D scales are divided into twelves to help with decimal & duodecimal calculations - hence the model number.
Image 1
Image 2
Image 3
Image 4
Image 5
