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The last replacement imperial artifact was made in bronze in 1845, and the most accurate measurement ever made of its length (much later) was 0.914 398 416 meters. In the U.S., the Mendenhall Order of 1893 tied the length of the U.S. yard to the meter, with the equivalence 39.37 inches = 1 meter, or approximately 0.914 401 828 803 658 meters ...
The normal length of a metre-stick made for the international market is either one or two metres, while a yardstick made for the U.S. market is typically one yard (3 feet or 0.9144 metres) long. Metre-sticks are usually divided with lines for each millimetre (1000 per metre) and numerical markings per centimetre (100 per metre), with numbers ...
The term, yard derives from the Old English gerd, gyrd etc., which was used for branches, staves and measuring rods. [5] It is first attested in the late 7th century laws of Ine of Wessex, [6] where the "yard of land" mentioned [6] is the yardland, an old English unit of tax assessment equal to 1 ⁄ 4 hide.
The base unit in the International System of Units (SI) is the meter, defined as "the length of the path travelled by light in vacuum during a time interval of 1 ⁄ 299792458 seconds." [ 4 ] It is approximately equal to 1.0936 yd .
The UK statute chain is 22 yards, which is 66 feet (20.1168 m). This unit is a statute measure in the United Kingdom, defined in the Weights and Measures Act 1985. [6] One link is a hundredth part of a chain, which is 7.92 inches (20.1168 cm).
In firearm optics, where 0.1 mrad per click is the most common mrad based adjustment value, another common rule of thumb is that an adjustment of 1 / 10 mrad changes the impact as many centimeters as there are hundreds of meters. In other words, 1 cm at 100 meters, 2.25 cm at 225 meters, 0.5 cm at 50 meters, etc.
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 rod is useful as a unit of length because integer multiples of it can form one acre of square measure (area).
Until early in the 20th century, it was the unit used to measure the depth of mines (mineral extraction) in the United Kingdom. [30] Miners also use it as a unit of area equal to 6 feet square (3.34 m 2) in the plane of a vein. [2] In Britain, it can mean the quantity of wood in a pile of any length measuring 6 feet (1.8 m) square in cross ...