Hi Richard again and again: You gave me a good idea about using a rubberband under florescent lights. You can vary the tension until you find frequencies which are multiples of the 60Hz alternating current. You can seen the complex waves. You can also see that the band does not vibrate in a circular motion, but in a motion more or less in line with the direction of your plucking. That is similar to struck strings in a piano. If you turn of the lights and hold the rubber band pointing toward the computer monitor, you can see various parials in operation. Thanks for the idea. It doesn't work exactly like a variable strobe light, the light is constant, but you can vary the tension and the amplitude. Jim Coleman, Sr.
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