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A Gunter's chain showing the individual links. The link (usually abbreviated as "l.", "li." or "lnk."), sometimes called a Gunter’s link, is a unit of length formerly used in many English-speaking countries. In US customary units modern definition, the link is exactly 66 ⁄ 100 of a US survey foot, [1] or exactly 7.92 inches or 20.1168 cm.
The 66-foot (20.1 m) chain is divided into 100 links, usually marked off into groups of 10 by brass rings or tags which simplify intermediate measurement. Each link is thus 7.92 inches (201 mm) long. A quarter chain, or 25 links, measures 16 feet 6 inches (5.03 m) and thus measures a rod (or pole).
One link is a hundredth part of a chain, which is 7.92 inches (20.1168 cm). [7] The surveyor's chain first appears in an illustration in a Dutch map of 1607, [8] and in an English book for surveyors of 1610. [9] In 1593 the English mile was redefined by a statute of Queen Elizabeth I as 5,280 feet, to tie in with agricultural practice.
5 ⁄ 16: 5 ⁄ 8: 5 ⁄ 8: 50: 3 ⁄ 8: 3 ⁄ 4: 6 ⁄ 8: 60: 1 ⁄ 2: 1: 8 ⁄ 8: 80: 5 ⁄ 8: Notes: *The pitch is the distance between roller centers. The width is the distance between the link plates (i.e. slightly more than the roller width to allow for clearance). *The right-hand digit of the standard denotes 0 = normal chain, 1 ...
A common metal short-link chain Roller chains. A chain is a serial assembly of connected pieces, called links, typically made of metal, with an overall character similar to that of a rope in that it is flexible and curved in compression but linear, rigid, and load-bearing in tension. A chain may consist of two or more links.
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Common uses of ball chain are for pull cords on light fixtures [1] and ceiling fans, keychains, and as retaining chains for things such as counter pens, and dogtag chains. Typical width is size 3, or 2.4 mm, steel ball chain. In the jewelry industry, pure 925 sterling silver may be in 1 mm, 1.2 mm, 1.5 mm, 1.8 mm, and 2.2 mm ball chain.
Date/Time Thumbnail Dimensions User Comment; current: 16:49, 12 August 2009: 720 × 720 (17 KB): AnonMoos: Various decorative depictions of the "L10a174" link of mathematical knot theory (i.e. a closed 5-link chain), including interlinked circles and pentagons, and interlaced "yin-yang" type shapes...