- noun (written as Foucault pendulum)a heavy pendulum suspended by a long thin wire that can swing in any direction
- A long pendulum set to swing with a heavy weight at its extreme end. If set up with adequate care, a Foucault Pendulum can be seen to rotate once a day through a full circle as the Earth turns beneath it, providing simple and powerful proof of the Earth’s rotation. Invented by Leon Foucault (1819–1868), French physicist.
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