FUSEE (3)

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.