Note 56 — PART XII. MATHEMATICS. (continued 2)
Reading edition
Gunter’s chain is in length 4 poles = 22 yards = 66 feet, and is divided into 100 links. Each link is therefore 22 100 of a yard, or 66 100 of a foot, or 7·92 inches. Land is estimated in acres, roods, and perches. An acre contains 10 square chains, or as much as 10 chains in length and 1 chain in breadth; or in yards it is 220 × 22 = 4840; or in poles it is 40 × 4 = 160 square poles; or in links it is 1000 × 100 = 100,000 square links. An acre is divided into 4 parts called roods, and a rood into 40 parts called perches, which are square poles, or the square of a pole of 5½ yards long, or the square of a quarter of a chain, or of 25 links, which is 625 links. Thus the divisions of land measure are—
625 square links = 1 pole, or perch.
40 perches = 1 rood.
4 roods = 1 acre.
The length of lines, measured with a chain, should be set down in links as integers, instead of in chains, and decimals. Therefore, after the content is found, it will be in square links.