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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]
Combination square rules are made of steel and can be purchased with gradations in metric, imperial, or both metric and imperial. Both faces of the rule have markings, providing four different sets of markings. This allows different sides to have different graduations (eg. 1mm or 0.5mm markings) or units (ie. metric and imperial).
Early Lufkin logo. The company was founded by Edward Taylor Lufkin, an American Civil War veteran of the Sixtieth Regiment Ohio Volunteer Infantry [1] in Cleveland, Ohio, 1869 [2] and was originally named E.T. Lufkin Board and Log Rule Manufacturing Company.
Pomona Electronics is a company specializing in electronic test equipment and accessories. It was founded in 1951 by Joseph J. and Carl W. Musarra, who were brothers. [7] [8] Founded to manufacture test cable harnesses for examining television cathode-ray tubes. [9] the company started in a factory location around the size of a living room. [9]
Because Johansson's blocks were so popular, his blocks became the de facto standard for manufacturers internationally, [11] [12] with other manufacturers of gauge blocks following Johansson's definition by producing blocks designed to be equivalent to his. [13] In 1930, the British Standards Institution adopted an inch of exactly 25.4 mm.
The formal definition of calibration by the International Bureau of Weights and Measures (BIPM) is the following: "Operation that, under specified conditions, in a first step, establishes a relation between the quantity values with measurement uncertainties provided by measurement standards and corresponding indications with associated measurement uncertainties (of the calibrated instrument or ...
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