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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 / Apex Type I
Gilson Slide Rule Co.
USA
Metal/celluloid
1936-1940
Ø 21 cm
General calculations
Notes:
Copyrighted design with a long-scale length of 64 cm. It had a short life and was replaced by the Binary model.
Image 1
Image 2
Image 3
Image 4
