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Despite the mechanical flaws of the stepped reckoner, it suggested possibilities to future calculator builders. The operating mechanism, invented by Leibniz, called the stepped cylinder or Leibniz wheel, was used in many calculating machines for 200 years, and into the 1970s with the Curta hand calculator.
A Leibniz wheel or stepped drum is a cylinder with a set of teeth of incremental lengths which, when coupled to a counting wheel, can be used in the calculating engine of a class of mechanical calculators. Invented by Leibniz in 1673, it was used for three centuries until the advent of the electronic calculator in the mid-1970s.
In 1770, Philipp Matthäus Hahn, a German pastor, built two circular calculating machines based on Leibniz' cylinders. [51] [52] J. C. Schuster, Hahn's brother-in-law, built a few machines of Hahn's design into the early 19th century. [53] In 1775, Lord Stanhope of the United Kingdom designed a pinwheel machine. It was set in a rectangular box ...
A pinwheel calculator is a class of mechanical calculator described as early as 1685, and popular in the 19th and 20th century, calculating via wheels whose number of teeth were adjustable. These wheels, also called pinwheels, could be set by using a side lever which could expose anywhere from 0 to 9 teeth, and therefore when coupled to a ...
Eve Bjørgum Bunting (née Bolton, December 19, 1928 – October 1, 2023), better known as Eve Bunting, was a Northern Irish-born American writer of more than 250 books. Her work covered a broad array of subjects and included fiction and non-fiction books.
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 creation of calculus in addition to many other branches of mathematics, such as binary arithmetic and statistics.
The computing machines of Christel Hamann; Erhard Anthes: The last Hamann machine, model 600 Archived March 8, 2017, at the Wayback Machine; Weiss, the calculating machine Gauss, original and model (pdf)
The received point of view in analytic philosophy and formal logic, is that the calculus ratiocinator anticipates mathematical logic—an "algebra of logic". [1] The analytic point of view understands that the calculus ratiocinator is a formal inference engine or computer program, which can be designed so as to grant primacy to calculations.