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    Great attention during this reign was devoted to the manufacturing of clocks and watches. To such eminence had the English manufacture of watches arrived, that in 1799 it was calculated that the value of watches and marine chronometers alone manufactured in and around London amounted to a million of money yearly. In 1762 John Harrison claimed the reward offered by Act of Parliament for a chronometer which would ascertain the longitude within sixty, forty, or thirty miles. For the least accurate of these the reward was ten thousand pounds, for the next more accurate fifteen thousand pounds, and for the best twenty thousand pounds. Harrison produced a chronometer which, after two voyages to the West Indies, entitled him to the highest prize, but a fresh Act of Parliament was passed, refusing him more than two thousand five hundred pounds until he had made known the principle of his invention, and assigned his chronometer for the public use. Even when these new terms were complied with he was only to receive ten thousand pounds, and the remainder on the correctness of the chronometer having been sufficiently tested. Harrison very justly complained of these new stipulations, and of the delays thus interposed; but in 1767, nine years before his decease, he obtained the full amount of the premium. In 1774 a premium of five thousand pounds was offered by Act of Parliament for a chronometer that should ascertain the longitude within one degree of a great circle, or sixty geographical miles; seven thousand five hundred pounds for one that would ascertain the longitude within two-thirds of that distance; and ten thousand pounds for one that would ascertain it within half a degree. This called out the efforts of various competitorsHarrison, Meadge, Kendal, Coombe, and numbers of others. In 1777 Meadge produced two, which were submitted to the test of the Astronomer-Royal, Dr. Maskelyne, and pronounced unfavourably upon; but Meadge petitioned Parliament against this decision, and, on the report of a committee on his chronometers, he was awarded a premium of two thousand five hundred pounds.

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