Gunter's chain

Gunter's chain (also known as Gunter’s measurement or Surveyor’s measurement) is a geodetic 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.