GEM calculator, 1890.

GEM calculator, 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.
 
Currently on display in:
Mathematics
Year made :
1890-1900
Inventory number :
1905-118