One of four ready reckoners, for assisting the con

Made:
1972-1976 in England

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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:
complete and plastic
Measurements:
overall (estimate): 2 x 80 x 150 mm
type:
ready reckoner (currency)
credit:
Science Museum (Great Britain)