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There are multiple size types, designed to fit somewhat different body shapes. Variations include the height of the person's torso (known as back length), whether the bust, waist, and hips are straighter (characteristic of teenagers) or curvier (like many adult women), and whether the bust is higher or lower (characteristic of younger and older women, respectively).
BS 3666:1982 Specification for size designation of women's wear BS 6185:1982 Specification for size designation of men's wear BS 3666:1982, the standard for women's clothing, is rarely followed by manufacturers as it defines sizes in terms of hip and bust measurements only within a limited range.
Vanity sizing, or size inflation, is the phenomenon of ready-to-wear clothing of the same nominal size becoming bigger in physical size over time. [ 1 ] [ 2 ] [ 3 ] This has been documented primarily in the United States and the United Kingdom . [ 4 ]
An example of two 'ghost' sprockets tensioning a triplex roller chain system. Roller chains are used in low- to mid-speed drives at around 600 to 800 feet per minute; however, at higher speeds, around 2,000 to 3,000 feet per minute, V-belts are normally used due to wear and noise issues. A bicycle chain is a form of roller chain.
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Chain wear is dominated by wear between pins and bushings, and this is the same as a modern roller chain. Skip-link chain is specific to bicycles and is not otherwise widely used. Skip link chain became obsolete sometime in the 1950s because roller chain was becoming more widely used in the manufacturing of bicycles. [1]
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Most often, the power is conveyed by a roller chain, known as the drive chain or transmission chain, [1] passing over a sprocket, with the teeth of the gear meshing with the holes in the links of the chain. The gear is turned, and this pulls the chain putting mechanical force into the system.