The Wayward Comet by Martin Beech

Author:Martin Beech
Language: eng
Format: epub
Publisher: Universal-Publishers

Figure 2.20. The internal components of the cometarium designed by W. and S. Jones. The large circular gear G is driven at its perimeter by the small gear located at O. Gears K and L provide the constant motion drive to gear O and the mean anomaly dial (via spindle S) respectively.

The end product cometarium constructed by the Jones’s was a polished affair (figure 2.21), with a brass face plate showing the comet’s path, divided appropriately into equal areas, a small mean motion dial and a larger dial to reveal the equation of center. The whole device was housed in a mahogany box, and it was clearly designed for close-quarter viewing, rather than lecture hall use. Only two cometaria by the Jones instrument makers are known to have survived: one is housed in the King George III collection of scientific instruments at the Science Museum in London, and the other was recently (2013) sold at auction by Bonhams to a private collection for a staggering bid coming-in at just under $80,000.

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