| Tourbillon A watch equipped with an intricate rotating carriage containing the balance wheel in the middle adjacent to the escapement. The carriage rotates about its axis once a minute. It compensates for the effect of the earth's gravity and improves the accuracy of the watch. |
| Fusee-and-chain transmission An original, early drive system in a spring-powered watch. It assures that the going train is driven with the same moment, or torque, regardless of the state of wind of the spring barrel. It improves the accuracy of the watch. |
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