What type of details about thomas earnshaw can be gathered from the following bio? Bio: thomas earnshaw -lrb- 4 february 1749 in ashton-under-lyne -- 1 march 1829 in london -rrb- 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 -lrb- for whom he worked -rrb- 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 n't 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 air-tight case -lrb- designed to reduce dust and draughts -rrb- . 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...
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