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<p>[QUOTE=&quot;fatima, post: 1560215, member: 22143&quot;]Mercury does have somewhat of a numismatic value.&nbsp;&nbsp; The Mercury pendulum is/was used in many antique grandfather clocks (and many other antique clocks) and finding one these days where the pendulum hasn&#039;t been broken is quite a challenge.&nbsp; Pristine examples are pretty expensive.&nbsp;&nbsp; They are difficult to replace if broken because of the issues listed above as nobody will work with mercury now.&nbsp;&nbsp; </p><p><br /></p><p>Do a search on google images for mercury filled pendulum.&nbsp; Some of them can sell for 1000s of dollars for just the pendulum.&nbsp; </p><p><br /></p><p>The reason that mercury was used in clock pendulums is the same reason it was used in thermometers.&nbsp; When the temperature changed, it caused the metal to rise and fall in the pendulum which compensated for similar changes made to the other metal parts in the clock.&nbsp; It made these clocks very accurate.</p><p><br /></p><p>-----------------</p><p><br /></p><p>Moral of the story is that I think this once common metal is being made valuable due to nothing more than excessive and overreaching government regulation.[/QUOTE]</p><p><br /></p>

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