Tourbillon
Addition to the mechanics of a watch escapement / From Wikipedia, the free encyclopedia
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For other uses, see Tourbillon (disambiguation).
In horology, a tourbillon (/tʊərˈbɪljən/; French: [tuʁbijɔ̃] "whirlwind") is an addition to the mechanics of a watch escapement to increase accuracy. Conceived by the British watchmaker and inventor John Arnold, it was developed by his friend the Swiss-French watchmaker Abraham-Louis Breguet and patented by Breguet on 26 June 1801.[1] In a tourbillon the escapement and balance wheel are mounted in a rotating cage, with the goal of eliminating errors of poise in the balance giving a uniform weight.[2]
Tourbillons are still included in some modern wristwatches, where the mechanism is usually exposed on the watch's face to showcase it.