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出典:『Wikipedia』 (2011/03/23 09:37 UTC 版)

英語による解説

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Jeremy Thacker was an 18th century writer and watchmaker, who coined the word chronometer for precise clocks designed to find longitude at sea. He himself created a marine chronometer positioned on gimbals and within a vacuum, but it was a failure. The idea of a vacuum for a marine clock had already been proposed by the Italian clockmaker Antonio Tempora in 1668. Slightly later, John Harrison would successfully build marine chronometers from 1730.