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  2. Stepped reckoner - Wikipedia

    en.wikipedia.org/wiki/Stepped_reckoner

    The stepped reckoner or Leibniz calculator was a mechanical calculator invented by the German mathematician Gottfried Wilhelm Leibniz (started in 1673, when he presented a wooden model to the Royal Society of London [2] and completed in 1694). [1]

  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

    Accordingly, he eventually designed an entirely new machine called the Stepped Reckoner; it used his Leibniz wheels, 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.

  5. Calculator Here We GO! - Wikipedia

    en.wikipedia.org/wiki/Calculator_Here_We_GO!

    Schickard and Pascal were followed by Gottfried Leibniz who spent forty years designing a four-operation mechanical calculator, the stepped reckoner, inventing in the process his leibniz wheel, but who couldn't design a fully operational machine. [13] There were also five unsuccessful attempts to design a calculating clock in the 17th century. [14]

  6. 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 ...

  7. Dying To Be Free - The Huffington Post

    projects.huffingtonpost.com/dying-to-be-free...

    The last image we have of Patrick Cagey is of his first moments as a free man. He has just walked out of a 30-day drug treatment center in Georgetown, Kentucky, dressed in gym clothes and carrying a Nike duffel bag. The moment reminds his father of Patrick’s graduation from college, and he takes a picture of his son with his cell phone.

  8. Category:Mechanical calculators - Wikipedia

    en.wikipedia.org/.../Category:Mechanical_calculators

    Pages in category "Mechanical calculators" The following 52 pages are in this category, out of 52 total. ... Stepped reckoner; T. Tabulating machine; Tally counter;

  9. All of these Black Friday deals would make very good gifts - AOL

    www.aol.com/lifestyle/all-of-these-black-friday...

    These extended Black Friday deals are the ultimate opportunity to snag high-quality gifts at some of the lowest prices of the year.