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LicenseGem Calculator', stylus-operated English currency adder, card
Science Museum Group
© The Board of Trustees of the Science Museum
"Gem Calculator", stylus-operated English currency adder, card, patented by J. Guthrie in 1890 and made by Arter, Dixon & Co., London, B4350, A180467
Details
- Category:
- Mathematics
- Collection:
- Sir Henry Wellcome's Museum Collection
- Object Number:
- 1989-642
- Materials:
- card
- credit:
- On loan from the Wellcome Trust
