One of four ready reckoners

Made:
1972-1976 in England

One of four ready reckoners, for assisting the conversion from L.s.d. to decimal currency, sponsored by the Daily Telegraph newspaper. A circular plastic dial with moveable cursor.

Details

Category:
Mathematics
Object Number:
1976-430/1
Materials:
plastic, plastic (unidentified) and complete
Measurements:
overall: 1 mm, 110 mm,
type:
ready reckoner (currency)
credit:
Science Museum (Great Britain)