GEM calculator, 1890.
Image number: 10327833
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).
- Image number:
- 10327833
- Credit:
- Science Museum/Science & Society Picture Library
- Date taken:
- 30 October 2003 09:16
- Image rights:
- Science Museum
