• 1862 March 18
    (b.) -
    1930 August 07


During the US Thanksgiving holidays of 1884 Dorr decided to build the prototype of a new calculating machine that he had invented. Because of his limited amount of money, he used a macaroni box for the outside box, and skewers, staples and rubber bands for the mechanism inside. It was finished soon after New Year's Day, 1885. Felt brought his idea to Chicago businessman Robert Tarrant. They signed a partnership contract on November 28, 1887, and incorporated the Felt & Tarrant Manufacturing Company on January 25, 1889. Felt later went on to invent more devices and acquired 46 domestic patents and 25 foreign ones. The original macaroni box prototype and the first Comptograph ever sold are now part of the Smithsonian Museum collection of antique calculators.
  • Date of Birth:

    1862 March 18
  • Date of Death:

    1930 August 07
  • Gender:

  • Noted For:

    Inventor of the Comptometer, the first commercially successful key-driven mechanical calculator
  • Category of Achievement:

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