Chladni's Figures: Vibrational modes of a metal plate

In this demonstration, an electric speaker is driven by a signal generator which constantly varies the frequency of vibrations. The meter shows the frequency of vibrations per minute (Hertz). About eighteen different pattens can be made by tuning the speaker under the plate.
UCB Index: 
PIRA Index: 
Demo Diagram: 



The basic equipment for this is stored behind the Viola bow driven plate in Le Conte 13-3. Just connect it to a signal generator.