CHARLES
XAVIER CALCULATING
DEVICE (1785-1870):
Charles Xavier Thomas
de Colmar invented the first calculating machine to be produced in large
numbers. This invention came about in France in 1820 as part of a national competition and the
machine was called the Arithmometer.
The Arithmometer was
essentially an early and large version of a pocket calculator (occupying
the best part of a desk), and by 1845 there was a
large, commercially successful industry involved in the manufacture of these
machines.
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