Dorr Felt created a wooden model out of rubber bands, meat skewers, twine, staples, and a macaroni box, which he completed in early 1885. This variant was eventually labeled the “macaroni box” model.
Comptometers were mostly used for addition, although they could also be used for subtraction, multiplication, and division. The Comptometer’s keyboard is divided into columns, each displaying one place or power of ten in the input number.
The Comptometer was a huge hit with businesses, particularly those with accounting departments, and it was extensively distributed.
In the early 1990s, comptometers were still used in a limited number, but electronic calculators and computers have now completely replaced them.