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• n  pendulum with a long wire; can swing in any direction; the change in the swing plane demonstrates the earth's rotation

• Foucault pendulum

News & Articles

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• COSI’s iconic pendulums keep swinging
  Shiny metal balls swing hypnotically from museum ceilings worldwide, knocking over tiny objects arranged in a circle on the floor. These Foucault pendulums elegantly demonstrate that Earth is spinning. They are named for French physicist Jean Foucault, who in 1851 was the first to prove the point using laboratory equipment instead of astronomical observations.
  Feb. 9, 2014 - The Columbus Dispatch