GEM calculator converted for Indian currency, 1912.
Image number: 10327831
The GEM calculator was originally patented in 1890 as a simple device for the addition of English money. Numbers are added by inserting a stylus against the figure and pulling downward. This later version is adapted for Indian currency.
- Image number:
- Science Museum/Science & Society Picture Library
- Date taken:
- 29 October 2003 12:16
- Image rights:
- Science Museum