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Brain Spice

Foucaults Hanging Pendulum

$80.00

This elegant device hangs from the ceiling, gently inscribing beautiful Lissajous patterns in the sand. It was first used in the Han dynasty China as an early seismometer, then studied in depth by Galileo. Their crowning moment came in 1851, when Jean Bernard Léon Foucault used a pendulum suspended from the dome of the Panthéon in Paris that was free to pivot to demonstrate the rotation of the Earth.