Where can I buy a large pendulum, so I can watch the plane of oscillation change as the earth rotates?
Thanks, Luke
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See the sources below for more information on the design of Foucault pendulums. Kits are commercially available; a pendulum kit with a 235-pound ball, magnetic drive, suspension cables (suggested length 50 feet), control unit, and accessories sells for $34,750 plus shipping. However, it should be possible for someone with engineering know-how to build a smaller, less accurate, but still functional pendulum for a lot less money.
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Check out http://itotd.com/articles/362/foucaults-pendulum/ and http://www.animations.physics.unsw.edu.au/jw/foucault_pendulum.html for some history and explanation of Foucault's original work on pendulums.
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