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| | Intro.html |
 | | A further discussion on the design options for cometaria is presented in On Ptolemy's Equant, Kepler's Second Law, and the Non-existent "Empty Focus" Cometarium published in the Journal of the Royal Astronomical Society of Canada (99 (4), 120 - 123). |
 | | The details of the motion produced by elliptical pulleys is discussed in J. Millburn's article Demonstrating the Motion of Comets [Space Education, 1(2), 1981, 55-58] and in M. Beech's article The mechanics and origin of cometaria [Journal of Astronomical History and Heritage, 5(2), 2002, 155-163]. |
 | | Since the motion of the comet about S is non-uniform (faster at perihelion and slower at aphelion), the uniform circular motion of crank N (as displayed in the upper circular dial) must be converted into non-uniform drive motion about S (through the pointer SYW). |
| uregina.ca /~astro/comet/Intro.html (1654 words) |
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