Archive of Collections

Details and Image

TypeModel No.MakerCountryConstruction
DateScale LengthArea of Use
Circular and Spiral Slide Rules
SIC / 1610-D (Rotolog 500)
Scientific Instrument Co.
Ø 12.7 cm
General calculations

Notes: Models from the ROTO series were possibly the only ones made by the Scientific Instrument Co. Although they could equally have been made by an unknown 3rd party. This model is a considered one of the best (complement and layout of scales) circular slide rules ever made.

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