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Details and Image

TypeModel No.MakerCountryConstruction
DateScale LengthArea of Use
Circular and Spiral Slide Rules
Gilson / Atlas Type III
Gilson Slide Rule Co.
Ø 21 cm
General calculations

Notes: "Third and last iteration of the design but the significance of the light-green background on this example is unknown. With a spiral long-scale of 1067 cm the Atlas calculator was, at the time, probably the most modestly priced high-precision slide rule on the market. It was in the same league as the Fuller, Thacher and the Ross precision slide rules."

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