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Gunter's chain (also known as Gunter's measurement) is a distance-measuring device used for surveying. It was designed and introduced in 1620 by English clergyman and mathematician Edmund Gunter (1581–1626). It enabled plots of land to be accurately surveyed and plotted, for legal and commercial purposes.
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).
Edmund Gunter designed and introduced the Gunter's chain in England in 1620. By correlating traditional English land measurements with the new decimal number system (which had just replaced Roman numerals), it combined ease and flexibility in taking surveying measurements in the field with ease of calculating results afterward.
Distances were always measured in chains and links, based on Edmund Gunter's 66-foot measuring chain. 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).
A chain 66 feet (20 m) long, with intermediate measurements indicated, was chosen for the purpose, and is called Gunter's chain. The length of the chain chosen, 66 feet (20 m), being called a chain gives a unit easily converted to area. [9] Therefore, a parcel of 10 square chains gives 1 acre.
In the case of roads or other linear infrastructure, a chainage (derived from Gunter's Chain - 1 chain is equal to 66 feet or 100 links) will be established, often to correspond with the centre line of the road or pipeline.
The Trader Joe's freezer section is famous for a reason, and the microwavable Indian meals that the chain has become known for have always been some of the most popular.
Drawing of a circumferentor from the Cyclopaedia Circumferentor with Gunter's chain at Campus Martius Museum in Marietta, Ohio. A circumferentor, or surveyor's compass, is an instrument used in surveying to measure horizontal angles. It was superseded by the theodolite in the early 19th century. [1]