The problem was so serious that in 1714 the British government established the award in 20 thousand pounds to anyone who can offer an accurate method of determining longitude during navigation. The accuracy should be so high that, if we were talking about the clock, its daily error was not to exceed three seconds for six weeks. The award went to the carpenter John Harrison who designed several timepieces - accurate clocks at sea. In 17б0 in the competition won its fourth model. During one voyage the accuracy of his watch was only 54 seconds for 156 days. Harrison found a way in which temperature fluctuations change the effective length of the terminal curve of the spring, providing automatic compensation for previous errors.
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