Surveyor’s Chain

—A measuring appliance, for land surveying, made in different patterns, as: 1. Gunter’s chain; this is 4 rods, 22 yards or 66 feet long =,th mile. It consists of 100 links, each link equaling 7.92 inches. Each tenth link is indicated by a bra tag; that for fifty links is circular and rather large, so as to be readily noticeable, the others are marked as follows from the center: 40 and 60 links four teeth on tag: 30 and 70 links, three teeth; 20 and 80 links, two teeth; 10 and 90 links, one tooth on tag. There are usually carried, with each chain, ten arrows for marking positions on the ground, each arrow being a pointed wire about 18 inches long, with a piece of red cloth tied to its ring. 2. Ramsden’s chain of 100 feet long, each link - being one foot in length. _ 3. Décametre chain of 10 mètres long, each link being one décimétre or 3.93 inches. In most countries using the metric system, a chain of twice this length is generally employed, having a length of 20 métres or 65.617 feet of 100 links, each measuring 7.874 inches.