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The fusee was a good mainspring compensator, but it was also expensive, difficult to adjust, and had other disadvantages: It was bulky and tall, and made pocket watches unfashionably thick. [14] If the mainspring broke and had to be replaced, a frequent occurrence with early mainsprings, the fusee had to be readjusted to the new spring.
Verge watches and clocks are sensitive to changes in the drive force; they slow down as the mainspring unwinds. [36] This is called lack of isochronism. It was much worse in verge and foliot clocks due to the lack of a balance spring, but is a problem in all verge movements.
The verge was the only escapement used in clocks and watches for 350 years. In spring-driven clocks and watches, it required a fusee to even out the force of the mainspring. It was used in the first pendulum clocks for about 50 years after the pendulum clock was invented in 1656.
A fusee is a practical necessity in watches using a verge escapement, and can also provide considerable benefit with a lever escapement and other high precision types of escapements (Hamiltons WWII era Model 21 chronometer used a fusee in combination with a detent escapement).
Jacques-Frédéric Houriet (1743–1830), Swiss watchmaker, Le Locle, pocket watch, tourbillon. [1] Jules Jürgensen (1745–1811), Danish watchmaker and manufacturer, Le Locle, pocket watch, longcase clock. Peter Kinzing (1745–1816), German clockmaker and mechanic. Daniel Möllinger (1746–1794), German clockmaker, Heidelberg, city clock maker.
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A chain, or cord, was wound around the plain barrel, connecting it to the fusee. Going barrel The form used in modern watches, is wound by turning the arbor and drives the watch movement by a ring of teeth around the barrel. This enables the mainspring to continue running the watch while it is being wound. Invented by Jean-Antoine Lépine.