In a fusee clock, the barrel turns the fusee by pulling on the chain, and the fusee turns the clock's gears.
In a fusee clock, the barrel turns the fusee by pulling on the chain, and the fusee turns the clock's gears. 1  When the mainspring is wound up (Fig. 1), all the chain is wrapped around the fusee from bottom to top, and the end going to the barrel comes off the narrow top end of the fusee. Most fusee clocks include a 'winding stop' mechanism to prevent the mainspring and fusee from being wound up too far, possibly breaking the chain. As it is wound, the fusee chain rises toward the top of the fusee. fu·see. n. 1. A usually cone-shaped pulley with a spiral groove, used in a cord-or chain-winding clock to maintain even travel in the timekeeping mechanism as the force of the mainspring lessens in unwinding. 2. a. A colored flare used as a warning signal for trucks and railroad trains.  There are basically 2 types of movements for cuckoo clocks. The 8 day movement needs to be wound only once a week. You can recognize a clock with 8 day movement by the larger pine cones (weights).A cuckoo clock with 1 day movement runs for about 30 hours, before you have to wind it again. Remember to hang the clock high enough (about 6 1/2 feet high), otherwise you have to wind it more frequently. : a conical spirally grooved pulley in a timepiece from which a cord or chain unwinds onto a cylinder containing the mainspring and which by its increasing diameter compensates for the lessening power of the spring. 2. 1. : a conical spirally grooved pulley in a timepiece from which a cord or chain unwinds onto a cylinder containing the mainspring and which by its increasing diameter compensates for the lessening power of the spring. 2. : a red signal flare used especially for protecting stalled trains and trucks. ADVERTISEMENT. Used in antique spring-powered mechanical watches and clocks, a fusee is a cone-shaped pulley with a helical groove around it, wound with a cord or chain which is attached to the mainspring barrel. Most fusee clocks include a 'winding stop' mechanism to prevent the mainspring and fusee from being wound up too far, possibly breaking the chain. As it is wound, the fusee chain rises toward the top of the fusee. The origin of the fusee is not known. Many sources erroneously credit clockmaker Jacob Zech of Prague with inventing it around 1525, but it actually appeared with the first spring driven clocks in the 15th century. Most fusee clocks include a 'winding stop' mechanism to prevent the mainspring and fusee from being wound up too far, possibly breaking the chain. As it is wound, the fusee chain rises toward the top of the fusee. The fusee (pronounced fu-say, from the French fusele, which means tapered or spindle shaped) was probably invented around1450, though some feel it was earlier. As the mainspring of a watch unwinds, it delivers progressively less torque to the wheel train, which, all else being equal, will make the watch run slower. The fusee is a tapered, spiraled, grooved pulley which is placed between the mainspring barrel and pinion of the center wheel (like the auto transmission, between engine and drive wheels). A very fine chain (or, earlier, cat gut string), is wound around the fussee. The verge (or crown wheel) escapement is the earliest known type of mechanical escapement, the mechanism in a mechanical clock that controls its rate by allowing the gear train to advance at regular intervals or 'ticks'. 
https://en.wikipedia.org/wiki/Fusee_(horology) http://www.thefreedictionary.com/fusee http://finecuckooclocks.com/guide.html http://www.merriam-webster.com/dictionary/fusee https://en.wikipedia.org/wiki/Fusee_(horology) https://en.wikipedia.org/wiki/Fusee_(horology) http://www.clockguy.com/SiteRelated/SiteReferencePages/FuseeMovement.html https://en.wikipedia.org/wiki/Verge_escapement
what does fusee movement mean in clocks