overcoil

overcoil
/oh"veuhr koyl'/, n. Horol.
1. a fixed end of a spiral hairspring, consisting of an upwardly and inwardly bent continuation of the outermost coil of the spring: used to offset the asymmetry of the common spiral spring when tight, which impairs isochronism.
2. a hairspring having such a fixed end.
[1880-85; OVER- + COIL1]

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Universalium. 2010.

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