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<p>[QUOTE="afantiques, post: 280531, member: 25"]Fake mercury pendulums can always be spotted by the way the silvering goes all the way to the top. On a real pendulum the glass tubes are about half full of mercury. </p><p>IN theory they provide temperature compensation, as heat expands the length of the pendulum rod, the mecury expands upwards to keep the centre of gravity in the same place.</p><p><br /></p><p>In some really fine quality longcase regulator clocks, the metal coefficients of expansion are carefully calculated to give just the compensation intended. In your average French 'table regulator' they are just decorative, for all practical purposes.[/QUOTE]</p><p><br /></p>
[QUOTE="afantiques, post: 280531, member: 25"]Fake mercury pendulums can always be spotted by the way the silvering goes all the way to the top. On a real pendulum the glass tubes are about half full of mercury. IN theory they provide temperature compensation, as heat expands the length of the pendulum rod, the mecury expands upwards to keep the centre of gravity in the same place. In some really fine quality longcase regulator clocks, the metal coefficients of expansion are carefully calculated to give just the compensation intended. In your average French 'table regulator' they are just decorative, for all practical purposes.[/QUOTE]
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