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  • "The device consists of a mounted metal disk having a large number of teeth with uniform spacings on its circumference. When the toothed disk is spun in rapid revolution, and an edge of a playing card is held against the teeth, it produces a shrill tone. When the speed of the wheel slows down, the shrill tone correspondingly diminishes in pitch. Thus, the frequency in tone is directly proportional to the rotation rate of the disk."

    --http://en.wikipedia.org/w/index.php?title=Savart_wheel&oldid=480827232

    June 12, 2012