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Details and Image



TypeModel No.MakerCountryConstruction
Material
DateScale LengthArea of Use
Disk
Atlas Type 3
GilsonUSA
Enameled Aluminum
1931diam. 20 cmHigh-Accuracy Calculation

Notes: "Very long spiral scale (25 turns, altogether about 34.4 ft) allows very high-accuracy calculations for a slide rule. In the manual the length is reported as 50 ft, but this assumes (incorrectly) that all 25 turns have the same diameter as the outermost spiral."


Image 1




Image 2