Invented by Leonardo Torres in 1920, the Torres calculating machine is a machine that solves essential addition, subtraction, multiplication, and division problems using a simple manner. It was a ...
IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF page to learn more. In 1895, Otto Steiger, a Swiss ...
In 1875 Frank S. Baldwin of St. Louis patented a pinwheel calculating machine. He manufactured a few of these machines, but they did not sell well. Baldwin went on to take out a number of other ...
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