Thomas Earnshaw, horologist, 1798.
4 0 c m
actual image size: 25cm x 32cm

Thomas Earnshaw, horologist, 1798.

Shee, Martin Archer

© Science Museum / Science & Society Picture Library


Oil on canvas portrait attributed to Sir Martin Archer Shee, showing Thomas Earnshaw (1749-1829) seated at a table, with a chronometer in the background. Earnshaw was a pioneer of chronometer manufacture, and first patented a spring detent chronometer escapement in 1782, an escapement which was the standard for marine chronometers throughout the 19th century. A detent in a time piece is a catch that regulates the striking mechanism.



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