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The Commissioners for the Discovery of the Longitude at Sea, or more popularly Board of Longitude, was a British government body formed in 1714 to administer a scheme of prizes intended to encourage innovators to solve the problem of finding longitude at sea. ==Origins== Navigators and scientists had been working on the problem of not knowing a ship's longitude. The establishment of the Board of Longitude was motivated by this problem and by the 1707 grounding of four ships of Vice-Admiral Sir Cloudesley Shovell's fleet off the Isles of Scilly, resulting in heavy loss of life. Established by Queen Anne the Longitude Act 1714 named 24 Commissioners of Longitude, key figures from politics, the Navy, astronomy and mathematics.〔(【引用サイトリンク】url=http://cudl.lib.cam.ac.uk/view/MS-RGO-00014-00001/19 )〕 However, the Board did not meet until at least 1737〔(【引用サイトリンク】url=http://cudl.lib.cam.ac.uk/view/ES-LON-00004 )〕 when interest grew in John Harrison's marine timekeeper. The Board administered prizes for those who could demonstrate a working device or method. The main longitude prizes were: *£10,000 for a method that could determine longitude within (£ as of ) *£15,000 for a method that could determine longitude within (£ as of ) *£20,000 for a method that could determine longitude within (£ as of ). In addition, the Board had the discretion to make awards to persons who were making significant contributions to the effort or to provide financial support to those who were working towards a solution. The Board could also make advances of up to £2,000 for experimental work deemed promising.〔Taylor, E.G.R., ''The Haven-finding Art: A History of Navigation from Odysseus to Captain Cook'', Hollis & Carter, London 1971, ISBN 0-370-01347-6〕 Under this heading, the Board made many lesser awards, including some awards in total £5,000 made to John Harrison before he received his main prize, an award of £3,000 to the widow of Tobias Mayer, whose lunar tables were the basis of the lunar data in the early decades of the Nautical Almanac, £300 to Leonhard Euler for his (assumed) contribution to the work of Mayer, £50 each to Richard Dunthorne and Israel Lyons for contributing methods to shorten the calculations connected with lunar distances, and awards made to the designers of improvements in chronometers. Even though many tried their hand at winning the main prize, for decades none was able to come up with a practical solution to the problem. The Board recognised that any serious attempt would be based on the recognition that the earth rotates through 15° of longitude every hour. The comparison of time between a known place (e.g., Greenwich) and the local time would determine longitude. Since local apparent time could be determined with some ease, the problem centred on finding a means of determining the time at a known place. For details of the efforts towards determining the longitude, see History of longitude. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Board of Longitude」の詳細全文を読む スポンサード リンク
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