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This profile was last updated on 11/19/12  and contains information from public web pages.

Thomas Earnshaw

Wrong Thomas Earnshaw?

Employment History

Web References
Manchester Celebrities and Famous People of the North-West, 19 Nov 2012 [cached]
Thomas Earnshaw
Manchester Engineers included George and Robert Stephenson, Thomas Earnshaw, James Hargreaves and Sir John Bradshaigh, 1 Jan 2002 [cached]
Thomas Earnshaw
Thomas Earnshaw, marine chronometer maker and horologist,
Thomas Earnshaw was a pioneer horologist and one of several developers of the marine chronometer. He was born in Mottram, Ashton-under-Lyne, Lancashire, (now in the Metropolitan Borough of Tameside). Though his youth was spent in Lancashire, he spent most of his productive adult life working in premises at 119 High Holborn in London, where he lived and raised his family. In 1782 he invented the so-called spring detent chronometer escapement, (also known as the chronometer escapement ), which was to become the standard for marine chronometers throughout the 19th century and essentially remained unchanged to the present day.
However, it was Earnshaw who had simplified the design of the pocket and marine chronometers into their modern, readily reproducible form. Both Arnold and Earnshaw had produced chronometers for £60 and these had become commonplace by the 1820s. Initially, Earnshaw did not hold the patent to his invention - this was owned by Thomas Wright because Earnshaw was unable to afford the cost of registration. Initially, Earnshaw did not hold the patent to his invention - this was owned by Thomas Wright because Earnshaw was unable to afford the cost of registration.
Earnshaw's so-called No.1 chronometer had been delivered for trials at the Royal Greenwich Observatory in February 1792, where it remained for two years until it was finally installed by Earnshaw himself at Armagh in Northern Ireland on the 18th August 1794, (where it remains to this day). There were rival claims as to the origination of his timepieces, and Earnshaw fought both of his horological rivals for more than a decade, as well as taking on the government in order to secure fair recognition and reward for his endeavours. His mechanism differed from its predecessors in that it gave impulse to the balance in one direction during a short section of its arc, and had the advantage over Arnold's type in not requiring oil on the escape wheel teeth. Disillusioned, Earnshaw even published an article, "Appeal to the Public" in 1808, in which he presented the evidence of his invention, but even this failed to gain the recognition he deserved.
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