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The link (usually abbreviated as "l.", "li." or "lnk."), sometimes called a Gunter’s link, is a unit of length formerly used in many English-speaking countries. A link is exactly of a foot,〔Holloway, Thomas (1881). (''The practical surveyor'' ). Horace Cox. London. p.4. Retrieved May 31, 2013.〕 or exactly 7.92 inches. The unit is based on Gunter's chain, a metal chain 66 feet long with 100 links, that was formerly used in land surveying. Even after the original tool was replaced by later instruments of higher precision, the unit itself was commonly used in this application throughout the English-speaking world (e.g. in the United States customary system of measurements and the Imperial system). The length of the foot, and hence the link, varied slightly from place to place and time to time, but in modern times the difference between, say, the US survey foot and the international foot is two parts per million. The link fell out of general use in the 20th century. == Proportions to other customary units == :Twenty-five links make a rod, pole or perch (16.5 feet). :One hundred links make a chain. :One thousand links make a furlong. :Eight thousand links make a mile. : 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「Link (unit)」の詳細全文を読む スポンサード リンク
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