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Details and Image
Type
Model No.
Maker
Country
Construction
Material
Date
Scale Length
Area of Use
Circular and Spiral Slide Rules
Gilson / Binary Type I
Gilson Slide Rule Co.
USA
Metal/celluloid
1920s
Ø 21 cm
General calculations
Notes:
First of two iterations of the copyrighted design with a long-scale length of 64 cm. Popular refined version of the Apex model.
Image 1
Image 2
Image 3
Image 4
Image 5
Image 6
