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Length; system unit code (other) symbol or abbrev. notes conversion factor/m combinations SI: gigametre: Gm Gm US spelling: gigameter 1.0 Gm (620,000 mi) megametre: Mm Mm US spelling: megameter
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.
Legally defined as 1.033 English feet in 1859 ≈ 0.314 858 ... perch (H ) rd ≡ 16 + 1 ⁄ 2 ft ... 1 ⁄ 100 of the energy required to warm one gram of air-free ...
In French North America, it was also equal to 25 square perches, but the royal perch of 18 feet was used, yielding a vergée of 8100 square feet (854.7 m 2) In Guernsey, a vergée (Guernésiais: vergie) is 17,640 square feet (1,639 m 2). It is 40 (square) Guernsey perches. A Guernsey perch (also spelt perque) is 21 feet by 21 feet. [1] [2]
Conversion of the Mach unit of speed depends on the altitude at which the speed is measured. That altitude should be specified either in feet (for example, |altitude_ft=10,000) or in metres (for example, |altitude_m=3,749). The altitude cannot be determined accurately and only a whole number is accepted. Examples:
180 feet (French measure) ≈ 58.47 m arpent, as a measure of area: 32 400 square feet (French measure) ≈ 3,418.89 m 2: perch, as a measure of length: 18 feet (French measure) ≈ 5.85 m perch, as a measure of area: 324 square feet (French measure) ≈ 34.19 m 2
William Smith (1851) gives a value of 0.9708 English feet, or about 295.9 mm. [2] An accepted modern value is 296 mm. [3] That foot is also called the pes monetalis to distinguish it from the pes Drusianus (about 333 or 335 mm) sometimes used in some provinces, particularly Germania Inferior. [4] [5]
perch, used variously to measure length or area; acre and acre's breadth; furlong; mile; The best-attested of these is the perch, which varied in length from 10 to 25 feet, with the most common value (16 1 ⁄ 2 feet or 5.03 m) remaining in use until the twentieth century. [1] Later development of the English system continued in 1215 in the ...