overcoil

(from the article `Breguet, Abraham-Louis`) ...He took refuge in Switzerland during the French Revolution and, upon his return to France, became a principal watchmaker of the empire. Among ...
Found on http://www.britannica.com/eb/a-z/o/41

Overcoil

A method of improving the isochronous characteristics of a hairspring by bending its outermost coil inwards and upwards so that it ends and is anchored well within the circumference of the spring.   Breguet invented it and it is often called after him;  see spiral Breguet.
Found on http://www.encyclo.co.uk/local/20450

Overcoil

In clock and watch making an overcoil is a fixed end of a spiral hairspring, consisting of an upwardly and inwardly bent continuation of the outermost coil of the spring and used to offset the asymmetry of the common spiral spring when tight, which impairs isochronism.
Found on http://www.probertencyclopaedia.com/browse/GO.HTM
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