John Harrison (1693– 1776) was a self-educated English carpenter and clockmaker. He invented the marine chronometer, a long-sought after device for solving the problem of establishing the East-West position or longitude of a ship at sea, thus revolutionising and extending the possibility of safe long-distance sea travel in the Age of Sail. The problem was considered so important, that the British Parliament offered financial rewards of up to £20,000 (£ million) under the 1714 Longitude Act.

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Keywords: -tone, art, arts, britain, carpenter, chronometer, clock, clockmaker, england, english, great, halftone, historical, history, images, kingdom, longitude, marine, mezzotint, pictures, uk, united