Step Reckoner (STEPRECK)

Internally funded project

Principal Investigator


No matching items found.

Project Details

Start date: 01/09/2003

End date: 04/09/2005



A Leibniz wheel or stepped drum was a cylinder with a set of teeth of incremental lengths which, when coupled to a counting wheel, was used in the calculating engine of a class of mechanical calculators. Invented by Leibniz in 1673, it was used for three centuries until the advent of the electronic calculator in the mid-1970s. Leibniz built a machine called the Stepped Reckoner based on that design in 1694.[1] It was made famous by Thomas de Colmar when he used it, a century and a half later, in his Arithmometer, the first mass-produced calculating machine.[2] It was also used in the Curta calculator, a very popular portable calculator introduced in the second part of the 20th century.


Stepped Reckoner

Other Team Members

No matching items found.

External Partners

No matching items found.

Research Areas


No matching items found.

Last updated on 2015-06-03 at 12:19