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  2. Mechanical calculator - Wikipedia

    en.wikipedia.org/wiki/Mechanical_calculator

    The comptometer-type calculator was the first machine to receive an all-electronic calculator engine in 1961 (the ANITA mark VII released by Sumlock comptometer of the UK). In 1890 W. T. Odhner got the rights to manufacture his calculator back from Königsberger & C , which had held them since it was first patented in 1878, but had not really ...

  3. Simple machine - Wikipedia

    en.wikipedia.org/wiki/Simple_machine

    A simple machine is a mechanical device that changes the direction or magnitude of a force. [1] In general, they can be defined as the simplest mechanisms that use mechanical advantage (also called leverage) to multiply force. [2] Usually the term refers to the six classical simple machines that were defined by Renaissance scientists: [3] [4 ...

  4. Pascal's calculator - Wikipedia

    en.wikipedia.org/wiki/Pascal's_calculator

    Pascal's calculator (also known as the arithmetic machine or Pascaline) is a mechanical calculator invented by Blaise Pascal in 1642. Pascal was led to develop a calculator by the laborious arithmetical calculations required by his father's work as the supervisor of taxes in Rouen . [ 2 ]

  5. Mechanical advantage - Wikipedia

    en.wikipedia.org/wiki/Mechanical_advantage

    Mechanical advantage is a measure of the force amplification achieved by using a tool, mechanical device or machine system. The device trades off input forces against movement to obtain a desired amplification in the output force.

  6. Stepped reckoner - Wikipedia

    en.wikipedia.org/wiki/Stepped_reckoner

    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.

  7. Screw mechanism - Wikipedia

    en.wikipedia.org/wiki/Screw_mechanism

    Greek philosophers defined the screw as one of the simple machines and could calculate its (ideal) mechanical advantage. [15] For example, Heron of Alexandria (52 AD) listed the screw as one of the five mechanisms that could "set a load in motion", defined it as an inclined plane wrapped around a cylinder, and described its fabrication and uses ...

  8. Calculator - Wikipedia

    en.wikipedia.org/wiki/Calculator

    An office calculating machine with a paper printer. A basic explanation as to how calculations are performed in a simple four-function calculator: To perform the calculation 25 + 9, one presses keys in the following sequence on most calculators: 2 5 + 9 =.

  9. The Millionaire (calculator) - Wikipedia

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

    In 1881 Chebyshev demonstrated a model of the calculation machine with automatic multiplication but did not take out a patent for it. In 1834 Luigi Torchi of Milan invented a direct multiplication machine. [3] The first patented multiplying machines was due to Edmund Barbour [4] (1872), Ramón Verea [5] (1878) and Léon Bollée (1889). [6]