Schickard combined Napier’s Bones, for multiplication and division, with a toothed-wheel system to add and subtract. It is the earliest known mechanical four-function calculator.
Tuesday, July 16, 2013
SCHICKARD CALCULATING CLOCK
A 1623 letter from William Schickard to astronomer Johannes Kepler is the only surviving record of Schickard’s calculator.
Schickard combined Napier’s Bones, for multiplication and division, with a toothed-wheel system to add and subtract. It is the earliest known mechanical four-function calculator.
Schickard combined Napier’s Bones, for multiplication and division, with a toothed-wheel system to add and subtract. It is the earliest known mechanical four-function calculator.
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