Felt and Tarrant Comptometer, 1887.

Felt and Tarrant Comptometer, 1887.
An early example of the Comptometer, with 72 numbered keys. The top of box has a plate engraved with varoius patents up to 1891. The Felt and Tarrant Comptometer was one of the first generation of mass-produced office calculators. It was extremely successful being able to multiply and subtract quickly and efficiently.
 
Currently on display in:
Mathematics
Year made :
c.1900
Inventory number :
1911-255