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Automatic watch. An automatic or self-winding watch is a mechanical watch in which the mainspring is wound automatically as a result of the natural motion of the wearer to provide energy to run the watch, making manual winding unnecessary. A mechanical watch which is neither self-winding nor electrically driven is called a manual watch. Most mechanical watches manufactured today are self-winding.
To help compensate for the diminishing power, a Fusee clock evens out the power of a clock spring throughout the entire period. British dial clocks have a large spring and a fusee barrel which allows the clock to run for eight days before needing to be wound. Without the Fusee mechanism the clock spring would supply the movement more power during the first three days of the unwind cycle than in the last five days.