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- Thomas Earnshaw (4 de febrer de 1749 a Ashton-under-Lyne - 1 de març de 1829 a Londres) va ser un rellotger anglès que, després del primer treball de John Arnold, va simplificar encara més el procés de producció del cronòmetre marí, fent-lo assequible al públic en general. També és conegut per les seves millores en el rellotge de trànsit al Royal Greenwich Observatory de Londres i la seva invenció d'un escapament de cronòmetre i d'una forma de compensació bimetàl·lica. (ca)
- Thomas Earnshaw (* 4. Februar 1749 in Ashton-under-Lyne; † 1. März 1829 in London) war ein englischer Uhrmacher, der als Erster den Bau von Marinechronometern vereinfachte, damit sich eine breitere Öffentlichkeit solche Instrumente leisten konnte. Er ist auch bekannt durch die Erfindung einer Chronometerhemmung und der bimetallischen Kompensationsunruh. (de)
- Thomas Earnshaw, né le 4 février 1749 à Ashton-under-Lyne et mort le 1er mars 1829 à Londres, est un horloger britannique. (fr)
- Thomas Earnshaw (4 February 1749 in Ashton-under-Lyne – 1 March 1829 in London) was an English watchmaker who, following John Arnold's earlier work, further simplified the process of marine chronometer production, making them available to the general public. He is also known for his improvements to the transit clock at the Royal Greenwich Observatory in London and his invention of a chronometer escapement and a form of bimetallic compensation balance. In 1780, he devised a modification to the detached chronometer escapement, the detent being mounted on a spring instead of on pivots. This spring detent escapement was patented by Thomas Wright (for whom he worked) in 1783. Whilst initially the design was crude and unsuccessful, with modifications it later became the standard form in marine chronometers, following the invention of the detent escapement by Pierre Le Roy in 1748. John Arnold also invented a similar escapement in 1782. In 1805, Earnshaw and Arnold were granted awards by the Board of Longitude for their improvements to chronometers; Earnshaw received £2500 and John Arnold's son John Roger Arnold received £1672. The bimetallic compensation balance and the spring detent escapement in the forms designed by Earnshaw have been used essentially universally in marine chronometers since then, and for this reason Earnshaw is generally regarded as one of the pioneers of chronometer development. Although he was principally a watchmaker, he did not shy away from building clocks. When asked by Nevil Maskelyne, he produced a clock for the Armagh Observatory. This clock incorporated Earnshaw's new design of escapement and had a number of novel features, including an airtight case (designed to reduce dust and draughts). It was highly praised by John Thomas Romney Robinson in the 19th century, who at that time believed it to be the most accurate clock in the world. In 1794, its purchase price was £100 and Earnshaw charged £100 to travel with it to Armagh and set it up in the new Observatory. The Observatory also purchased Earnshaw's second clock which was operated at sidereal rate with Edward Troughton's Equatorial Telescope. (en)
- トーマス・アーンショウ（Thomas Earnshaw 1749年2月4日 - 1829年3月1日）はイギリスの時計師である。 (ja)
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- Thomas Earnshaw (4 de febrer de 1749 a Ashton-under-Lyne - 1 de març de 1829 a Londres) va ser un rellotger anglès que, després del primer treball de John Arnold, va simplificar encara més el procés de producció del cronòmetre marí, fent-lo assequible al públic en general. També és conegut per les seves millores en el rellotge de trànsit al Royal Greenwich Observatory de Londres i la seva invenció d'un escapament de cronòmetre i d'una forma de compensació bimetàl·lica. (ca)
- Thomas Earnshaw (* 4. Februar 1749 in Ashton-under-Lyne; † 1. März 1829 in London) war ein englischer Uhrmacher, der als Erster den Bau von Marinechronometern vereinfachte, damit sich eine breitere Öffentlichkeit solche Instrumente leisten konnte. Er ist auch bekannt durch die Erfindung einer Chronometerhemmung und der bimetallischen Kompensationsunruh. (de)
- Thomas Earnshaw, né le 4 février 1749 à Ashton-under-Lyne et mort le 1er mars 1829 à Londres, est un horloger britannique. (fr)
- トーマス・アーンショウ（Thomas Earnshaw 1749年2月4日 - 1829年3月1日）はイギリスの時計師である。 (ja)
- Thomas Earnshaw (4 February 1749 in Ashton-under-Lyne – 1 March 1829 in London) was an English watchmaker who, following John Arnold's earlier work, further simplified the process of marine chronometer production, making them available to the general public. He is also known for his improvements to the transit clock at the Royal Greenwich Observatory in London and his invention of a chronometer escapement and a form of bimetallic compensation balance. The Observatory also purchased Earnshaw's second clock which was operated at sidereal rate with Edward Troughton's Equatorial Telescope. (en)
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- Thomas Earnshaw (ca)
- Thomas Earnshaw (de)
- Thomas Earnshaw (fr)
- トーマス・アーンショウ (ja)
- Thomas Earnshaw (en)
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