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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.
A rectangle that is one furlong (i.e., 10 chains, or 40 rods) in length and one rod in width is one rood in area, as is any space comprising 40 perches (a perch being one square rod). The vergée was also a quarter of a Normandy acre, and was equal to 40 square perches (1 Normandy acre = 160 square perches).
rod; pole; perch (H) rd ... 1 ⁄ 100 of the energy required to warm one gram of air-free water from 0 °C to 100 °C at a pressure of 1 atm ≈ 4.190 02 J:
A perch is equal to a square rod (1 square rod is 0.00625 acre) 4 roods; A furlong by a chain (furlong 220 yards, chain 22 yards) 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)
The surveyor is assisted by a chainman. A ranging rod (usually a prominently coloured wooden pole) is placed in the ground at the destination point. Starting at the originating point the chain is laid out towards the ranging rod, and the surveyor then directs the chainman to make the chain perfectly straight and pointing directly at the ranging ...
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Determination of the rod, using the length of the left foot of 16 randomly chosen people coming from church service. Surveyors in the United States continue to use: chain (22 yards, or 20.1168 m) rod (also called pole or perch) (quarter of a chain, 5 1 ⁄ 2 yards, or 5.0292 m)
The units were based on "English measure" but used a linear perch measuring 7 yards (6.4 m) as opposed to the English rod of 5.5 yards (5.0 m). Thus, linear units such as the furlong and mile , which were defined in terms of perches, were longer by a factor of 14:11 (~27% more) in Irish measure, while units of area, such as the rood or acre ...