"A slight tap on the Chladni wave plate now accelerates the normal 20,000 oscillations per second to 180,000 per second." The Snell Manuscript

Chladni Plate mathematics: http://soundofstars.org/bessel functions - Chladni Plate Mathematics.htm

See Also

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Chladni Plate Vibrations
Chladni
Cymatics - Jenny
Cymatics
Modal Analysis
resonating plates
Table of Plate Harmonics and Intervals
Vibratory Disk
wave plate