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Ordinary 150 mm (6 in) digital calipers made of stainless steel have a rated accuracy of 0.02 mm and a resolution of 0.01 mm (0.0005 in). [11] The same technology is used for longer calipers, but accuracy declines to 0.03 mm (0.001 in) for 100–200 mm (4–8 in) and 0.04 mm (0.0015 in) for 200–300 mm (8–12 in) measurements.
Excavations at Lothal dating to 2400 BCE have yielded one such ruler calibrated to about 1 ⁄ 16 inch (1.6 mm) [3] Ian Whitelaw (2007) holds that 'The Mohenjo-Daro ruler is divided into units corresponding to 1.32 inches (34 mm) and these are marked out in decimal subdivisions with remarkable accuracy—to within 0.005 inches (0.13 mm).
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]
James Chesterman, a British metalworker, is credited with the invention of the first retractable tape measure in 1821. [6] His design consisted of a spring-loaded cloth strip with marked measurements, housed within a compact case. Building upon his prior design, Chesterman would patent the first steel tape measure. [7]
The heads, occasionally called anvils, are attached to the rule by sliding the rule into a slot in the side of the head. The head is then tightened in place via a lock bolt or lock nut which engages with a channel running the full length of the rule, allowing the head to be tightened on at any point along the rule.
They are also made in several sizes such as 4, 6, 7, 8 and 12 inch, and 25 cm. Embedded degree gradations on the tool eliminate the need for trigonometric calculations and allow for lines to be more easily made. The Speed Square tool is an isosceles right triangle with a ruler on one equal side and a fence on the other.
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