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[[File:Foucault pendulum animated.gif|thumb|alt=Diagram of a simple pendulum showing the amplitude of its swing.|right|205px|The precession of the plane of a Foucault pendulum. The speed of the precession is highly exaggerated.]]
'''Foucault's pendulum''' is a weight, usually a sphere, suspended by a wire that is attached at the ceiling with a joint that allows the weight to swing in any direction.
'''Foucault's pendulum''' is a weight, usually a sphere, suspended by a wire that is attached at the ceiling with a joint that allows the weight to swing in any direction.