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A variety of rulers A 2 m (6 ft 6 + 3 ⁄ 4 in) 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, 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]
Westcott Rule Company. The history of school and office products brand Westcott dates back to 1872, when Henry Westcott, together with his two sons Charles and Frank Westcott, started manufacturing wooden furniture used by printers and trellis units in Seneca Falls, New York. [ 1 ] The company expanded rapidly and became one of the largest ...
Slide rule. Typical ten-inch (25 cm) student slide rule (Pickett N902-T simplex trig) A slide rule is a hand -operated mechanical calculator consisting of slidable rulers for evaluating mathematical operations such as multiplication, division, exponents, roots, logarithms, and trigonometry.
TL;DR: Upgrade your ruler with the Rollova 2.0 Digital Ruler, on sale for $76.99. As of Feb. 17, use code MEASURE18 to score 35% off the original price. If you still keep a standard ruler around ...
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Digital caliper. Rather than a rack and pinion, digital calipers use a linear encoder. A liquid-crystal display shows the measurement, which often can switch units between millimeters and fractional or decimal inches. All provide for zeroing the display at any point along the slide, allowing the same sort of differential measurements as with ...