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A quarter chain, or 25 links, measures 16 feet 6 inches (5.03 m) and thus measures a rod (or pole). Ten chains measure a furlong and 80 chains measure a statute mile. [1] Gunter's chain reconciled two seemingly incompatible systems: the traditional English land measurements, based on the number four, and decimals based on the number 10.
The UK statute chain is 22 yards, which is 66 feet (20.1168 m). This unit is a statute measure in the United Kingdom, defined in the Weights and Measures Act 1985. [6] One link is a hundredth part of a chain, which is 7.92 inches (20.1168 cm).
The practice of using surveyor's chains, and perch-length rods made into a detachable stiff chain, came about a century later when iron was a more plentiful and common material. A chain is a larger unit of length measuring 66 feet (20.1168 m), or 22 yards, or 100 links, [11] or 4 rods (20.1168 meters).
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 was commonly used throughout the English-speaking world, for example in the United States customary units and the Imperial system .
Timothy Wonnacott (born 12 March 1951) [1] is an English chartered auctioneer, chartered surveyor, [2] antiques expert, narrator, and a television presenter.He was previously a director of Sotheby's, one of the world's oldest auction houses.
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The United States previously defined the furlong, chain, rod, and link in terms of the U.S. survey foot of exactly 1200 ⁄ 3937 metre, [14] resulting in a furlong approximately 201.1684 m long. The difference of approximately two parts per million between the old U.S. value and the "international" value was insignificant for most practical ...
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