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  2. Stepped reckoner - Wikipedia

    en.wikipedia.org/wiki/Stepped_reckoner

    The stepped reckoner was based on a gear mechanism that Leibniz invented and that is now called the Leibniz wheel. It is unclear how many different variants of the calculator were made. Some sources, such as the drawing to the right, show a 12-digit version. [5] This section describes the surviving 16-digit prototype in Hanover. Leibniz wheel

  3. Leibniz wheel - Wikipedia

    en.wikipedia.org/wiki/Leibniz_wheel

    Thomas de Colmar Arithmometer (from 1852, significantly different from his 1820 model) uses Leibnitz stepped drum. Considered by many to be the first largely successful mechanical calculator, and the first to be produced in large numbers (thousands) – Gottfried Leibniz built his first stepped reckoner in 1694 and another one in 1706. [3]

  4. Mechanical calculator - Wikipedia

    en.wikipedia.org/wiki/Mechanical_calculator

    In 1672, Gottfried Leibniz started designing an entirely new machine called the Stepped Reckoner. It used a stepped drum, built by and named after him, the Leibniz wheel, was the first two-motion calculator, the first to use cursors (creating a memory of the first operand) and the first to have a movable carriage. Leibniz built two Stepped ...

  5. Gottfried Wilhelm Leibniz - Wikipedia

    en.wikipedia.org/wiki/Gottfried_Wilhelm_Leibniz

    Gottfried Wilhelm Leibniz (or Leibnitz; [a] 1 July 1646 [O.S. 21 June] – 14 November 1716) was a German polymath active as a mathematician, philosopher, scientist and diplomat who is credited, alongside Sir Isaac Newton, with the discovery of calculus in addition to many other branches of mathematics, such as binary arithmetic and statistics.

  6. Wikipedia : GLAM/NHMandSM/SM Galleries/Mathematics

    en.wikipedia.org/wiki/Wikipedia:GLAM/NHMandSM/SM...

    File:Working model of a Leibniz stepped reckoner. File:Early set of drawing instruments by William Cary, in pocket fish-skin case (10 pieces in case), 1795-1825.

  7. Is It Holiday Fatigue Or Covid-19? Here Are The Symptoms To ...

    www.aol.com/holiday-fatigue-covid-19-symptoms...

    If you're traveling for the holidays, you're probably feeling a bit worn-down—but is it just fatigue, or could it be COVID-19?. It’s probably been a minute since you last thought about COVID ...

  8. 3 Americans held for years in China released and back in U.S.

    www.aol.com/3-americans-held-years-china...

    Three Americans have been released after spending years imprisoned in China, the White House said Wednesday. Mark Swidan, Kai Li and John Leung were released and would soon "return and be reunited ...

  9. Calculus ratiocinator - Wikipedia

    en.wikipedia.org/wiki/Calculus_ratiocinator

    Leibniz constructed just such a machine for mathematical calculations, which was also called a "stepped reckoner". As a computing machine, the ideal calculus ratiocinator would perform Leibniz's integral and differential calculus. In this way the meaning of the word, "ratiocinator" is clarified and can be understood as a mechanical instrument ...