Archive of Collections



Details and Image



TypeModel No.MakerCountryConstruction
Material
DateScale LengthArea of Use
Disk
Ross Rapid Computer
Louis Ross"San Francisco, U.S.A."
Metal
est 1918Diam 12.5 cmGeneral Calculations

Notes: "General numerical calculations plus trignometric and angle scales, included case with notebook and storage for magnifier and the rapid rule."


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