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License"Gem" calculating machine, J. Guthrie's patent No.15062, 1890
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"Gem" calculating machine, J. Guthrie's patent No.15062, 1890
Gem' calculating machine, J.Guthrie's patent No 15062, 1890. The GEM calculator is a simple device for the addition of English money. Numbers are added by inserting a stylus against the figure and pulling downward.
Details
- Category:
- Mathematics
- Object Number:
- 1905-118
- Materials:
- wood (unidentified), paint, paper (fibre product) and metal (unknown)
- Measurements:
-
Overall: 220 mm x 105 mm x 5 mm, 0.07 kg
- type:
- adding machine (stylus)
- credit:
- Major-General H.P. Babbage
