Mechanical watches don’t have batteries; their power comes from stored energy inside the movement’s barrel. The barrel is a large gear that contains a coiled mainspring and a flat steel spring. The full name is the. [pdf]
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In a the watch's gears are turned by a spiral spring called a . In a manual watch, energy is stored in the mainspring by turning a knob, the crown, on the side of the watch. Then the energy from the mainspring powers the watch movement until it runs down, requiring the spring to be wound again. A self-winding watch movement has a mechanism which winds the mainspring using the natural motio. .
A mechanical watch is a that uses a to measure the passage of time, as opposed to which function using the modes of a , or , which are quartz watches synchronized to an via . A mechanical watch is driven by a which must be wound either periodically by hand or via a mec. [pdf]
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