Tourbillon
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In horology, a tourbillon 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. 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.
An assembled tourbillon
Anthony Randall's double axis tourbillon as installed in a carriage clock
Greubel Forsey Double Tourbillon Technique, an example of which won the 2011 International Chronometry Competition held by the Horological Museum in Le Locle
Greubel Forsey Double Tourbillon 30° mechanism
Jaeger-LeCoultre
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Manufacture Jaeger-LeCoultre SA, or simply Jaeger-LeCoultre, is a Swiss luxury watch and clock manufacturer founded by Antoine LeCoultre in 1833 and is based in Le Sentier, Switzerland. Since 2000, the company has been a fully owned subsidiary of the Swiss luxury group Richemont.
Monument of Antoine LeCoultre
Share of the SA de la Fabrique d'Horlogerie LeCoultre & Cie, issued 30. June 1899
Speedometer 1934 Talbot 105
The Reverso watch