3/21/2023 0 Comments Perpetual timepiece![]() The Greater London Council, The Iveagh Bequest, Kenwood, Hampstead Lane, London, © 1985. John Joseph Merlin, " The Ingenious Mechanick".Ord-hume, " Clockwork Music", Allen & Unwin, London 1973. William Nicholson, Philosophical Journal, vol I, 1799, p375.William Nicholson, " Concerning those perpetual motions which are produced in machines by the rise and fall of the barometer or thermometrical variations in the dimensions of bodies".ISBN 0-8478-0261-2.Įxternal articles and further reading Journals New York: Rizzoli International Publications. Perpetual Motion: The History of an Obsession. The Atmos, manufactured by Jaeger LeCoultre is a modern clock which is similar to Cox's clock although the main driving force is generated from temperature differential, instead of pressure differential. It is unknown whether Cox was aware of Drebbel's device. The gold machine was mounted in a globe on pillars and was powered by changes in air pressure (a sealed glass tub with liquid varied in volume through atmospheric pressure changes, rewinding constantly). Similar clocks Ī similar design is Cornelis Drebbel's circa 1610 device that told the time, date, and season. The barometer contained 68 kilograms (150 pounds) of mercury (approximately 5 litres). ![]() The prime mover, encased in a finely detailed clock body, is a Fortin mercury barometer. The clock is designed to enable the timepiece to run indefinitely and overwinding is prevented by a safety mechanism. This keeps the mainspring coiled inside the barrel. The change of pressure in the Earth's atmosphere acts as an external energy source and causes sufficient movement of the winding mechanism. The clock is similar to other mechanical clocks, except that it does not need winding. The clock still exists, but was deactivated at the time of its relocation to the Victoria and Albert Museum in London. 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. It was developed in collaboration with John Joseph Merlin (with whom Cox also worked on developing automata). Cox's timepiece is a clock developed in the 1760s by James Cox.
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