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Brunsviga calculating machine, c 1950.

Brunsviga calculating machine, c 1950.
3 0 c m
actual image size: 32cm x 22cm


Barrel calculating machines were smaller, lighter and easier to operate than their predecesors, Arithmometers. The machine performs multiplication by repeated addition and included the wheel with a variable number of teeth as patented by Willgodt T Odhner (1845-1905) in 1891. Odhner sold the German patent to Mesrs Grimme, Natalis & Co.

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© Science Museum / Science & Society Picture Library

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