Leibniz stepped reckoner - photo

[Altair]

The stepped reckoner was a mechanical calculator capable of performing all four arithmetic operations. It was invented by the German polymath Gottfried Wilhelm Leibniz in the 1670s.

Fullsize image: https://s3-us-west-1.amazonaws.com/h...r_fullsize.jpg



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[neilbourjaily]

More than a polymath. Leibniz was the co-discoverer of the Calculus (Denied by Newton's supporters). His notations survive to this day.