Early 20th century calculator

Early 20th century calculator

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Caption: Early 20th century calculator. This hand calculator, the Brunsviga 20, is mechanically operated by a handcrank (right). Addition and subtraction sums were performed in a single operation, but multiplication and division were accomplished by repeated mechanical additions and subtractions. The German company Brunsviga introduced their calculators in 1885 and had produced over 20,000 machines by 1912.

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Keywords: 1900s, 20th century, black-and-white, brunsviga 20, calculator, computer, england, english, hand calculator, hand crank, historical, history of science, machine, mathematical, mathematics, maths, mechanical, model 20, monochrome, national physical laboratory, npl, technological, technology

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