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Harrison's fourth marine chronometer, 1759.

Harrison's fourth marine chronometer, 1759.
4 0 c m
actual image size: 26cm x 32cm


John Harrison (1693-1776), English inventor and horologist, discovered the means by which longitude could be determined accurately. He developed a marine chronometer which, in a voyage to Jamaica (1761- 1762) determined the longitude within 18 geographical miles. He also invented the gridiron pendulum (1726), the going fusee and the remontoir escapement.

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