GEM calculator converted for Indian currency, 1912.

Image number: 10327831

GEM calculator converted for Indian currency, 1912.

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:
10327831
Credit:
Science Museum/Science & Society Picture Library
Date taken:
29 October 2003 12:16
Image rights:
Science Museum