Charles Xavier Thomas
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Charles Xavier Thomas de Colmar (1785-1870) designed and patented the Arithmometer, in 1820. It was the first successful mechanical calculator that could add, subtract, and multiply. It could also divide with some user intervention. Using principles from previous mechanical calculators of the period, Thomas’s calculator was the most reliable calculator yet and was in production for ninety years. The Arithmometer was very large and would occupy an entire desk. Thomas was important for the advancement of the calculator and early computers.
[edit] Marriage
He married the Duchess of Bojano and had a son, Thomas de Bojano.
[edit] External link
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