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  2. Eccentric-hub scooter - Wikipedia

    en.wikipedia.org/wiki/Eccentric-hub_scooter

    Although several patents for eccentric-hub cycles exist from 1928, [1] [2] the most popular incarnation was patented in 1934 by brothers Phillip and Prescott Huyssen and called the "Exercycle". [3] It was produced by the Ingersoll Steel & Disc Co. (a division of Borg-Warner Corp.), from 1934 to 1937, under the name "Ingo-bike". A large number ...

  3. Geocentric model - Wikipedia

    en.wikipedia.org/wiki/Geocentric_model

    The 5 planets General eastward motion through zodiac: Eastward motion of deferents; period set by observation of planet going around the ecliptic Planets Retrograde motion: Motion of epicycle in same direction as deferent. Period of epicycle is time between retrograde motions (synodic period). Planets Variations in speed through the zodiac