Cox's timepiece is a clock developed in the 1760s by James Cox. It was developed in collaboration with John Joseph Merlin (with whom Cox also worked on developing automata). Cox claimed that his design was a true perpetual motion machine, but as the device is powered from changes in atmospheric pressure via a mercury barometer, this is not the case. The clock still exists, but was deactivated at the time of its relocation to the Victoria and Albert Museum in London.[1]
- ^ Ord-Hume, Arthur W. J. G. (1977). Perpetual Motion: The History of an Obsession. New York: St. Martin's Press. ISBN 0-312-60131-X., p. 118 (online copy, p. 118, at Google Books)