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Although link chains were later superseded by the steel ribbon tape (a form of tape measure), its legacy was a new statutory unit of length called the chain, equal to 22 yards (66 feet) of 100 links. [8] This unit still exists as a location identifier on British railways, as well as all across America in what is called the public land survey ...
The chain (abbreviated ch) is a unit of length equal to 66 feet (22 yards), used in both the US customary and Imperial unit systems. It is subdivided into 100 links . [ 1 ] [ 2 ] There are 10 chains in a furlong , and 80 chains in one statute mile . [ 2 ]
In 1959, the international yard and pound agreement established the "international" yard length of 0.9144 meters, upon which both the customary U.S. and imperial units of length have since been based. Even so, the Mendenhall Order length of the yard continues in use even in 2013 in the United States as the basis for the survey foot.
The chain – an actual metal chain – was made up of 100 links, each being 7.92 inches (201 mm) long. Eighty chains constitute one U.S. survey mile (which differs from the international mile by a few millimeters).
The rod, perch, or pole (sometimes also lug) is a surveyor's tool [1] and unit of length of various historical definitions. In British imperial and US customary units, it is defined as 16 + 1 ⁄ 2 feet, equal to exactly 1 ⁄ 320 of a mile, or 5 + 1 ⁄ 2 yards (a quarter of a surveyor's chain), and is exactly 5.0292 meters.
The survey was a chain of quadrangles containing 33 triangles in all. ... Europeans used chains with links of a known length such as a Gunter's chain, ...
Their accuracy was adequate for cadastral surveying but they were deemed insufficiently accurate for the Anglo-French Survey (1784–1790), Britain's first high-precision survey. Roy asked Ramsden to prepare a new chain of 100 links, each one foot in length. [12] He also asked Ramsden to prepare three precisely-calibrated wooden rods 20 feet long.
Traverse networks involve placing survey stations along a line or path of travel, and then using the previously surveyed points as a base for observing the next point. Connected survey lines form the framework and the directions and lengths of the survey lines are measured with an angle measuring instrument and tape or chain. [2]