EARNSHAW - Thomas. London (High Holborn).

1749: born

1829: died

1782: Devised spring detent chronometer escapement, patented approx. same time as John Arnold and Ferdinand Berthoud did.

Patentowner: Thomas Wright, because Earnshaw was not able to finance the cost for the patent.

Did much to develop the chronometer.

Awarded £3,000 by Board of Longitude.

His chronometers were described in a publication by the Commissioners of Longitude in 1806.

He appealed about the award in 1808 and a Parliamentary report was published in 1809.