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The rod, perch, or pole (sometimes also lug) is a surveyor's tool [1] and unit of length of various historical definitions. In British imperial and US customary units, it is defined as 16 + 1 ⁄ 2 feet, equal to exactly 1 ⁄ 320 of a mile, or 5 + 1 ⁄ 2 yards (a quarter of a surveyor's chain), and is exactly 5.0292 meters.
The vergée was also a quarter of a Normandy acre, and was equal to 40 square perches (1 Normandy acre = 160 square perches). The rood was an important measure in surveying on account of its easy conversion to acres. When referring to areas, rod is often found in old documents and has exactly the same meaning as rood. [3]
Since an acre measured 10 square chains in Gunter's system, the entire process of land area measurement could be computed using measurements in chains, and then converted to acres by dividing the results by 10. [2] Hence 10 chains by 10 chains (100 square chains) equals 10 acres, 5 chains by 5 chains (25 square chains) equals 2.5 acres.
40 rods by 4 rods, 160 rods 2 (historically fencing was often sold in 40 rod lengths [49]) 1 ⁄ 640 (0.0015625) square mile (1 square mile is equal to 640 acres) Perhaps the easiest way for US residents to envision an acre is as a rectangle measuring 88 yards by 55 yards ( 1 ⁄ 10 of 880 yards by 1 ⁄ 16 of 880 yards), about 9 ⁄ 10 the ...
For this reason, the furlong was once also called an acre's length, [2] though in modern usage an area of one acre can be of any shape. The term furlong, or shot, was also used to describe a grouping of adjacent strips within an open field. [3] Among the early Anglo-Saxons, the rod was the fundamental unit of land measurement.
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{{convert|1.2|km2|acre sqyd ha}} → 1.2 square kilometres (300 acres; 1,400,000 sq yd; 120 ha) {{convert|1.2|km2|acre+sqyd+ha}} → 1.2 square kilometres (300 acres; 1,400,000 sq yd; 120 ha) In the following, because "board feet" contains a space, using a space to make a combination fails. {{convert|123|cuyd|m3 board feet}} → 123 cubic yards ...
This was standardised to be exactly 40 rods or 10 chains. An acre was the amount of land tillable by one man behind one team of eight oxen in one day. Traditional acres were long and narrow due to the difficulty in turning the plough and the value of river front access. An oxgang was the amount of land tillable by one ox in a ploughing season ...