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In the Middle Ages, bars were used as standards of length when surveying land. [22] These bars often used a unit of measure called a rod, of length equal to 5.5 yards, 5.0292 metres, 16.5 feet, or 1 ⁄ 320 of a statute mile. [23] A rod is the same length as a perch or a pole. [24] In Old English, the term lug is also used.
A variety of rulers A carpenter's rule Retractable flexible rule or tape measure A closeup of a steel ruler A ruler in combination with a letter scale. A ruler, sometimes called a rule, scale or a line gauge or metre/meter stick, is an instrument used to make length measurements, whereby a length is read from a series of markings called "rules" along an edge of the device. [1]
The Birmingham gauge ranges from 5/0 or 00000, the lowest gauge number corresponding to the largest size of 0.500 inches (12.7 mm), to 36, the highest gauge number corresponding to the smallest size of 0.004 inches (0.10 mm). The increments between gauge sizes are not linear and vary. [2]
The gauge is placed against the edge to be checked and any light leakage between the blade and edge indicates a mismatch that requires correction. Ring gauge: a cylindrical ring of steel whose inside diameter is finished to gauge tolerance and is used for checking the external diameter of a cylindrical object. Strain gauge
[21] [22] [23] Try square, or joiner's square A try square is the woodworking equivalent of an engineer's square. Made with a thin steel blade fixed at 90° into a thicker stock that is typically made of wood. The inside face of the stock is sometimes faced with brass to reduce wear.
The ruler the simplest kind of length measurement tool: lengths are defined by printed marks or engravings on a stick. The metre was initially defined using a ruler before more accurate methods became available. Gauge blocks are a common method for precise measurement or calibration of measurement tools.