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| Keywords: Fusee 310x155.png A fusee a mechanism used in antique clocks and watches to even out variation in the force of the mainspring as it unwinds during the clock's running time The device on the right is the fusee which is turned by the mainspring barrel on the left and then drives the clock's gears As the mainspring barrel turns more chain is wound onto the barrel from the fusee and the increasing diameter of the fusee increases the leverage to compensate for the weaker pull of the mainspring Fusees appeared with the first spring-driven clocks in the 15th century and were used until the 1800s Downloaded from http //books google com/books id 4zECAAAAQAAJ pg PA301 Chambers William Robert 1874 Information for the People 5th Ed Vol I W R Chambers London on Google Books 1874 William Chambers Public domain - author died more than 70 years ago PD-old Fusee horology | ||||
