Gunter's measurement

Gunter's chain
Gunter's chain at Campus Martius Museum
Unit information
Unit system	imperial/US units
Unit of	length
Unit conversions
1 gunter's chain in ...	... is equal to ...
imperial/US units	22 yd
metric (SI) units	20.1168 m

Gunter's chain or the surveyor's chain (also known as Gunter’s measurement or surveyor’s measurement) is a distance measuring device used for land survey. It was designed and introduced in 1620 by English clergyman and mathematician Edmund Gunter (1581–1626) long before the development of the theodolite and other more sophisticated equipment, enabling plots of land to be accurately surveyed and plotted, for legal and commercial purposes.

Gunter developed an actual measuring chain of 100 links. These, the chain and the link, have become units of their own.

The 66-foot (~20.117 m) chain is divided into 100 links, usually marked off into groups of 10 by brass rings or tags which simplify intermediate measurement. Each link is thus 7.92 inches long. A quarter chain, or 25 links, is known as a rod or pole. Ten chains make up a furlong and 80 chains equal a statute mile.

Gunter's chain reconciled two seemingly incompatible systems: the traditional English land measurements, based on the number four, and the newly introduced system of decimals based on the number 10. Since an acre measured 10 square chains in Gunter's system, the entire process of land measurement could be computed in decimalised chains and links, and then converted to acres by dividing the results by 10.

The method of surveying a field or other parcel of land with Gunter's chain is to first determine corners and other significant locations, and then to measure the distance between them, taking two points at a time. The surveyor is assisted by a chainman. A ranging rod (usually a prominently coloured wooden pole) is placed in the ground at the destination point. Starting at the originating point the chain is laid out towards the ranging rod, and the surveyor then directs the chainman to make the chain perfectly straight and pointing directly at the ranging rod. A pin is put in the ground at the forward end of the chain, and the chain is moved forward so that its hind end is at that point, and the chain is extended again towards the destination point. This process is called ranging, or in the US, chaining; it is repeated until the destination rod is reached, when the surveyor notes how many full lengths (chains) have been laid, and he can then directly read how many links (one-hundredth parts of the chain) are in the distance being measured.