New postby podge » Mon Nov 23, 2009 2:50 pm

Balance (In French: balancier)

A circular, moving part which oscillates on its rotational axis or staff. It is attached to the balance-spring which gives it the regular to-and-fro motion needed to give a watch regularity. Each to-and-fro movement ("tick-tock") is called an oscillation, and each oscillation comprises two vibrations.

A circular rim is held by spokes, and in later watches is split and bi-metallic, to compensate for temperature variations. Combined with the balance spring it forms the regulating heart of a watch.
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Re: Balance

New postby Glyn Meredith » Fri Mar 12, 2010 11:13 am

Origins are uncertain but the balance wheel appeared with the first mechanical clocks, in 14th century Europe. It is an improved version of the foliot. The first clocks in northern Europe used foliots, while those in southern Europe used balance wheels.
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