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  2. Mechanical calculator - Wikipedia

    en.wikipedia.org/wiki/Mechanical_calculator

    The 19th century also saw the designs of Charles Babbage calculating machines, first with his difference engine, started in 1822, which was the first automatic calculator since it continuously used the results of the previous operation for the next one, and second with his analytical engine, which was the first programmable calculator, using ...

  3. 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]

  4. Difference engine - Wikipedia

    en.wikipedia.org/wiki/Difference_engine

    A difference engine is an automatic mechanical calculator designed to tabulate polynomial functions. It was designed in the 1820s, and was first created by Charles Babbage. The name difference engine is derived from the method of divided differences, a way to interpolate or tabulate functions by using a small set of polynomial co-efficients.

  5. Arithmometer - Wikipedia

    en.wikipedia.org/wiki/Arithmometer

    ami19.org – A great site for patents and articles on 19th century mechanical calculators; Making the Arithmometer count – An in-depth study of the machine; Rechenmaschinen-Illustrated – A large display of mechanical calculators; How the Arithmometer Works A detailed animation describing the design and workings of the arithmometer calculator.

  6. The Millionaire (calculator) - Wikipedia

    en.wikipedia.org/wiki/The_Millionaire_(calculator)

    John Wolff's Web Museum An in-depth technical description of The Millionaire calculator. History of Computer website A historical and technical article about The Millionaire calculator. Arithmetical Machines & Instruments / 19th Century; Jim Falk's things-that-count.com showing the rare 10 slider Millionaire calculator

  7. Calculator - Wikipedia

    en.wikipedia.org/wiki/Calculator

    It was not until the 19th century and the Industrial Revolution that real developments began to occur. Although machines capable of performing all four arithmetic functions existed prior to the 19th century, the refinement of manufacturing and fabrication processes during the eve of the industrial revolution made large scale production of more ...

  8. Slide rule - Wikipedia

    en.wikipedia.org/wiki/Slide_rule

    Engineer using a slide rule, with mechanical calculator in background, mid 20th century A more modern form of slide rule was created in 1859 by French artillery lieutenant Amédée Mannheim , who was fortunate both in having his rule made by a firm of national reputation, and its adoption by the French Artillery.

  9. Comptometer - Wikipedia

    en.wikipedia.org/wiki/Comptometer

    The Comptometer was the first commercially successful key-driven mechanical calculator, patented in the United States by Dorr Felt in 1887.. A key-driven calculator is extremely fast because each key adds or subtracts its value to the accumulator as soon as it is pressed and a skilled operator can enter all of the digits of a number simultaneously, using as many fingers as required, making ...