Savart wheel

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“The Savart wheel consists of a heavy metal toothed wheel that may be put in rapid revolution by pulling a cord wound upon its axis. Set such a wheel in rapid motion and hold the edge of a card against its teeth. As the speed of the wheel diminishes, the shrill tone produced by the rapid vibrations of the card correspondingly falls in pitch.” — Avery, 1895


Elroy M. Avery School Physics (New York: Sheldon and Company, 1895) 228


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