GEM calculator, 1890.

Hills, Jennie

 
GEM calculator, 1890.
4 0 c m
 
34cm
actual image size: 26cm x 32cm

Description

The GEM calculator is a simple device for the addition of money. Numbers are added by inserting a stylus against the figure and pulling downwards. The design for this calculator was patented by J Guthrie in 1890 (patent no 15062).

© Science Museum / Science & Society Picture Library

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