====== Fusée-and-chain transmission ======
{{wst>image_l|Kette_und_Schnecke|[[Fusée-and-chain transmission]]\\ © [[Zenith]]|260px}}
The power transmission with fusée (**fusée-and-chain transmission**) ensures a constant driving force in the [[movement]].

The gradual discharging of a mechanical watch causes a loss of amplitude and a corresponding loss of precision. On the contrary, with a fusée-chain transmission system, the driving force remains entirely stable throughout the duration of the [[power reserve]]. Whereas the spring at its heart imparts its strength to the [[barrel]], the helicoidal shape of the fusée -- stemming from a complex calculation performed specifically for the [[mainspring]] -- compensates for the variations in force of the barrel that will progressively occur.

The French term, **cabestan** is often associated with fusée-and-chain watches as it refers to the capstan or winch that collects the chain. This term was adopted as the name of Swiss watchmaker [[Cabestan]], which launched a watch based on this concept in [[2008]].

Examples of watches using this design principle 

  * [[A. Lange & Söhne Tourbillon "Pour le Mérite"]]
  * [[A. Lange & Söhne Tourbograph "Pour le Mérite"]]
  * [[Zenith Academy Christophe Colomb Hurricane]]


{{tag>Terms}}