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Engraved portrait of John Harrison
John Harrison was a self-educated English carpenter and later a clockmaker. He invented the marine chronometer, a long-sought device in solving the problem of establishing the East-West position or longitudeof a ship at sea, thus revolutionising and extending the possibility of safe long distance sea travel in the Age of Sail.
Who-is-Who in MMS, History of machines, history of mechanical engineering, machine design, designer, inventor,.