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stepped reckoner


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  • Gesundheit.

    September 20, 2011

  • Has anyone made a Leibniz list?

    September 19, 2011

  • 1674, Germany. Gottfried Wilhelm Leibniz invented a device that used a special type of gear called the Stepped Drum or Leibniz wheel, a cylinder with nine bar-shaped teeth along its length. He named his machine the Staffelwalze or the Stepped Reckoner. The machine could add, subtract, multiply, divide, and even evaluate square roots by a series of additions. See Calculating Devices.

    January 27, 2008