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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).
The chain is the unit of linear measurement for the survey of the public lands as prescribed by law. All returns of measurement in the rectangular system are made in the true horizontal distance in links, chains, and miles. The only exceptions to this rule are special requirements for measurement in feet in mineral surveys and townsite surveys ...
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.
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Twenty half-links in a new chain measure 10 inches (254 mm), and replacement is recommended before the old chain measures 10 + 1 ⁄ 16 inches (256 mm) (0.7% wear). [6] A more conservative limit is when 24 half-links in the old chain measure 12 + 1 ⁄ 16 inches (306 mm) (0.5% wear).
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Different lengths as in respect to the electromagnetic spectrum, measured by the metre and its derived scales.The microwave is between 1 meter to 1 millimeter.. The millimetre (international spelling; SI unit symbol mm) or millimeter (American spelling) is a unit of length in the International System of Units (SI), equal to one thousandth of a metre, which is the SI base unit of length.