French calculating machine, late 18th C

French calculating machine, late 18th C

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Credit: CCI ARCHIVES/SCIENCE PHOTO LIBRARY

Caption: French calculating machine. Late-18th century calculating machine from France. The machine consists of a series of six rotating cylinders marked with numbers, and a grid for adding numbers in the hinged lid. Roman numerals at right mark the nine levels of numbers on the cylinders. This type of calculating machine is known as a rotary calculator, and operates in a similar way to an abacus, achieving multiplication by repeated addition.

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Keywords: 1700s, 18th century, calculating machine, calculator, computing, computing history, cylinder, device, dial, dials, equipment, european, french, historical, history, machine, number, numbers, one, single, technological, technology

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