Archive of Collections



Details and Image



TypeModel No.MakerCountryConstruction
Material
DateScale LengthArea 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.


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Image 6