Exactus adder

Made:
1945-1955 in England

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Science Museum Group Collection
© The Board of Trustees of the Science Museum

Exactus stylus-operated adding and subtracting device, with swivelling half plate for add and subtract options, marked "Mini-Add Made in England", c. 1950. The Exactus is one of several simple stylus-operated calculators to have been popular in the mid 20th century.

Details

Category:
Mathematics
Object Number:
1981-861
Materials:
plastic (unidentified), steel (metal) and tin (metal)
type:
adding machines
credit:
Post Office Telecom. Museum (Taunton)