Foucault pendulum

noun Fou·cault pendulum \ˌfü-ˈkō-\

Definition of Foucault pendulum

  1. :  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

Origin and Etymology of foucault pendulum

J. B. L. Foucault

First Known Use: 1931

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contemplative of or relative to the past

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