File:Pocket Watch Balance Wheel.jpg

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English: A bimetallic temperature compensated balance wheel from an early 1900s pocket watch. 1.8cm diameter. The rim is made of two bimetallic semicircular arms, composed of a layer of brass on the outside fused to a layer of steel on the inside. As the temperature increases, the arms bend slightly inward, causing the balance to oscillate faster, to compensate for the thermal loss of elasticity of the spring. Moving opposing pairs of weights nearer the ends of the arms (1) increases temperature compensation. Unscrewing pairs of weights near the spokes (2) slows the oscillation rate.
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Author Chris Burks (Chetvorno)
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(Reusing this file)		 I, Chris Burks, release this image into the public domain for any use whatever.

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Public domain This work has been released into the public domain by its author, Chris Burks (Chetvorno). This applies worldwide.
In some countries this may not be legally possible; if so:
Chris Burks (Chetvorno) grants anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.

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current16:41, 19 June 2007Thumbnail for version as of 16:41, 19 June 20071,612 × 1,612 (287 KB)Chetvorno (talk | contribs){{Information |Description=A bimetallic temperature compensated balance wheel from an early 1900s pocket watch. 1.8cm diameter. The rim is made of two bimetallic semicircular arms. As the temp. increases, they bend inward, causing the balance to oscill

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