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Screwfix Direct Limited, trading as Screwfix, is a retailer of trade tools, accessories and hardware products based in the United Kingdom. [6] Founded in 1979 as the Woodscrew Supply Company, the company was acquired in July 1999 by Kingfisher plc , which also owns B&Q , and is listed on the London Stock Exchange .
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. [4] [2]
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]
Helix was established in 1887 under the name 'The Universal Woodworking Company Ltd.'; it manufactured wooden rulers and metal laboratory apparatus. In 1894, it patented the drawing compass and, with it, launched the Helix brand, following on from the initial success of the compass and rule. In 1912, the company's first mathematical set was ...
Such a region is commonly known as a U, for unit, RU for rack unit or, in German, HE, for Höheneinheit. Heights within racks are measured by this unit. Rack-mountable equipment is usually designed to occupy some integer number of U. For example, an oscilloscope might be 4U high. Rack-mountable computers and servers are mostly between 1U and 4U ...
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).
Farrand's new design was a concave/convex tape made of metal which would stand straight out a distance of four to six feet. This design is the basis for most modern pocket tape measures used today. With the mass production of the integrated circuit (IC) the tape measure has also entered into the digital age with the digital tape measure.
<noinclude>[[Category:Ruler navigational boxes]]</noinclude> to the end of the template code, making sure it starts on the same line as the code's last character.
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