Dictionary entry

Fusee (3)

Webster's Dictionary 1913

Fu‐see″, n. [F. fusée a spindleful, fusee, LL. fusata, fr. fusare to use a spindle, L. fusus spindle.] (a) The cone or conical wheel of a watch or clock, designed to equalize the power of the mainspring by having the chain from the barrel which contains the spring wind in a spiral groove on the surface of the cone in such a manner that the diameter of the cone at the point where the chain acts may correspond with the degree of tension of the spring. (b) A similar wheel used in other machinery.