One of four ready reckoners

Made:: 1972-1976 in England

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One of four ready reckoners
Science Museum Group
© The Board of Trustees of the Science Museum

One of four ready reckoners, for assisting the conversion from L.s.d. to decimal currency and from imperial to metric measures. A rectangular plastic dial with optical display, namely two sets of figures available depending upon the viewing angle.

Details

Category:: Mathematics

Object Number:: 1976-430/3

Materials:: plastic and complete

Measurements:: overall (estimate): 2 x 80 x 150 mm

type:: ready reckoner (currency)

credit:: Science Museum (Great Britain)

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One of four ready reckoners

Details

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