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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]
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 ...
A loosely riveted hook lets a tape measure measure inner (1) and outer (2) lengths. Measuring tapes designed for carpentry or construction often use a curved metallic ribbon that can remain stiff and straight when extended, but can also retract into a coil for convenient storage. This type of tape measure will have a hook on the end to aid ...
DVDs are only one of a number of ways of viewing home video. Home video is recorded media sold or rented for home viewing. [1] The term originates from the VHS and Betamax era, when the predominant medium was videotapes, but has carried over to optical disc formats such as DVD and Blu-ray. In a different usage, "home video" refers to amateur ...
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).
Amateur film equipment became standardized in the 1920s and 30s with the 9.5 mm, 16 mm, and 8 mm formats. By the late 1950s, home movies became cheaper to make, becoming available to the middle class. In the mid-1960s, Super 8's ease of use led to home movies being even more popular. [7]
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A ruler with two linear scales: the metric and imperial.It includes shorter minor graduations and longer major graduations. A graduation is a marking used to indicate points on a visual scale, which can be present on a container, a measuring device, or the axes of a line plot, usually one of many along a line or curve, each in the form of short line segments perpendicular to the line or curve.