7.92 inches = 1 link (l.)
25 links = 1 rod (rd.)
4 rods or 100 links = 1 chain (ch.)
80 chains = 1 mile (mi.)
mi. ch. rd. l. in.
1 = 80 = 320 = 8000 = 63360
The linear unit commonly employed by surveyors is Gunter’s chain, which
is 4 rods or 66 feet.
An engineers’ Chain, used by civil engineers, is 100 feet long, and
consists of 100 links.