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Pendulum

The Foucault pendulum of the Griffith Observatory.

 

The pendulum swings independently of the Earth's rotation. As the Earth rotates, the pendulum's direction will slowly change relative to the ground, here causing pegs to be knocked down one after another. This experiment demonstrates that the Earth rotates, and was devised by Léon Foucault in 1851.

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Uploaded on July 26, 2013
Taken on November 15, 2012