The fusée is a cone-shaped component connected to the mainspring's barrel by a chain As the mainspring is wound, the rotating barrel winds the chain around the narrowing fusée As the watch runs and the power stored by the mainspring decreases, the tension from the fusée's chain on the barrel, now rotating in the reverse direction, ensures that a consistent amount of energy is released through the movement until there is none left.
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The Fusée And Chain: From Function To Fashion In 4 Wristwatches From A. Lange

Uploaded 5 years ago

The fusée is a cone-shaped component connected to the mainspring's barrel by a chain As the mainspring is wound, the rotating barrel winds the chain around the narrowing fusée As the watch runs and the power stored by the mainspring decreases, the tension from the fusée's chain on the barrel, now rotating in the reverse direction, ensures that a consistent amount of energy is released through the movement until there is none left.

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