100 ft land measuring chain of iron with brass handles comprising 100 links of 1 foot.
Also known as a Gunter’s chain (or 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 more information see https://en.wikipedia.org/wiki/Gunter’s_chain.