First Known Use: 1931
Dictionary
Foucault pendulum
noun Fou·cault pendulum \ˌfü-ˈkō-\
Definition of FOUCAULT PENDULUM
: a freely swinging pendulum that consists of a heavy weight hung by a long wire and that swings in a constant direction which appears to change showing that the earth rotates
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Origin of FOUCAULT PENDULUM
J. B. L. Foucault
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