A Leibniz Stepped Reckoner calculator

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Date
1673ca.
Credit Line
Courtesy of the Deutsches Museum, M√ľnchen
Keywords
1673; Stepped drum; Mechanical calculation
Object ID
102630768

In 1673, Leibniz built the first true four-function calculator. His unique, drum-shaped gears formed the basis of many successful calculator designs for the next 275 years, an unbroken record for a single underlying calculator mechanism. Leibniz built several versions of the Stepped Reckoner over about 45 years. Only one survives today.