Foucault pendulum

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Foucault pendulum

n.
A simple pendulum suspended from a long wire and set into motion along a meridian. The plane of motion appears to turn clockwise in the Northern Hemisphere and counterclockwise in the Southern Hemisphere, demonstrating the axial rotation of the earth.

[After Jean Bernard Léon Foucault.]
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Noun1.Foucault pendulum - pendulum with a long wire; can swing in any direction; the change in the swing plane demonstrates the earth's rotation
pendulum - an apparatus consisting of an object mounted so that it swings freely under the influence of gravity