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A balance wheel, or balance, is the timekeeping device used in mechanical watches and small clocks, analogous to the pendulum in a pendulum clock. It is a weighted wheel that rotates back and forth, being returned toward its center position by a spiral torsion spring , known as the balance spring or hairspring .
A pocket watch is a watch that is made to be carried in a pocket, ... The balance wheel and balance spring provide a separate function: to regulate the timing (or ...
The verge escapement consists of a wheel shaped like a crown, called the escape wheel, with sawtooth-shaped teeth protruding axially toward the front, and with its axis oriented horizontally. [ 13 ] [ 36 ] In front of it is a vertical rod, the verge, with two metal plates, the pallets, that engage the teeth of the escape wheel at opposite sides.
As with the pendulum, the escapement must provide a small kick each cycle to keep the balance wheel oscillating. Also, the same lubrication problem occurs over time; the watch will lose accuracy (typically it will speed up) when the escapement lubrication starts failing. [citation needed] Pocket watches were the predecessor of modern wristwatches.
Pocket watch with gears labelled. The going train is the main gear train of the timepiece. It consists of the wheels that transmit the force of the timepiece's power source, the mainspring or weight, to the escapement to drive the pendulum or balance wheel. [4] The going train has two functions.
The balance wheel continues clockwise, again free from interference until it is pulled back by the hairspring to the center position. The cycle then starts again. Each back and forth movement of the balance wheel from and back to its center position corresponds to a drop of one tooth (called a beat).
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