A balance wheel is the timekeeping device used in mechanical watches and some 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, the balance spring or hairspring. It is driven by the escapement, which transforms the rotatin...
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http://en.wikipedia.org/wiki/Balance_wheel
• A wheel which regulates the beats or pulses of a watch or chronometer, answering to the pendulum of a clock; -- often called simply a balance. • A wheel which imparts regularity to the movements of any engine or machine; a fly wheel. • A ratchet-shaped scape wheel, which in some watches is acted upon by the axis of the bal...
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http://thinkexist.com/dictionary/meaning/balance_wheel/
Most often seen on horse-drawn vehicles, it is a small rotating or stationary wheel normally attached to a front hoof, or a shaft suspended between two horses, and which facilitates passage across the floor.
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http://www.encyclo.co.uk/local/10141
Bal'ance wheel` 1. (Horology) (a) A wheel which regulates the beats or pulses of a watch or chronometer, answering to the pendulum of a clock; -- often called simply a
balance .
(b) A ratchet-shaped scape wheel, which in some watches is acted upon by the axis of the balance wheel proper (in...
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http://www.encyclo.co.uk/webster/B/7
The regulating organ of a watch, which vibrates on a spiral hairspring whose lengthening or shortening causes the balance wheel to move faster or slower, advancing or retarding the watch
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http://www.saffronart.com/sitepages/jewelry/glossary.aspx
[
n] - a wheel oscillating against the hairspring of a timepiece to regulate its beat
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http://www.webdictionary.co.uk/definition.php?query=balance%20wheel
noun a wheel that regulates the rate of movement in a machine; especially a wheel oscillating against the hairspring of a timepiece to regulate its beat
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https://www.encyclo.co.uk/local/20974
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