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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 electrodes for electrical grounding are often called ground rods and are often made from steel with a copper clad surface – typically 1 to 2 m long and 20 millimetres (0.79 in) in diameter. These are driven vertically into the ground and bonded together with bare copper wire. [1]
The even less common Rathborn system, also from the 17th century, is based on a 200-link chain of two rods (33 feet, 10.0584 m) length. Each rod (or perch or pole) consists of 100 links, (1.98 inches, 50.292 mm each), which are called seconds (″), ten of which make a prime ( ′ , 19.8 inches, 0.503 m).
A rod is the same length as a perch or a pole. [24] In Old English, the term lug is also used. The length is equal to the standardized length of the ox goad used for teams of eight oxen by medieval English ploughmen. [25] The lengths of the perch (one rod unit) and chain (four rods) were standardized in 1607 by Edmund Gunter.
The rod is a historical unit of length equal to 5 + 1 ⁄ 2 yards. It may have originated from the typical length of a mediaeval ox-goad. There are 4 rods in one chain. The furlong (meaning furrow length) was the distance a team of oxen could plough without resting. This was standardised to be exactly 40 rods or 10 chains.
In 1824, the United Kingdom officially reformed their system of units in legislation that established what came to be known as the Imperial system, but the standard of the yard remained the length of the artifact. The last replacement imperial artifact was made in bronze in 1845, and the most accurate measurement ever made of its length (much ...
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Surveyor's view of the levelling rod with the crosshair. This indicates a reading of 1.422 m, interpolated between the 1.420 m and 1.430 m marks. Rods come in two classes: Self-reading rods (sometimes called speaking rods). Target rods. Self-reading rods are rods that are read by the person viewing the rod through the telescope of the instrument.
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