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Circular steel
bands of various diameters are mounted on a plate which has been
cemented to a loudspeaker. By adjusting the frequency of the speaker,
a graphic illustration of harmonic resonance can be seen in the
rings as they vibrate at various frequencies and in different modes
of vibration. The frequency of the speaker can be read directly
on a digital counter. Exciter levers are provided for two of the
rings so they may be struck lightly and their natural frequency
"observed."
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