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Rayleigh disk

noun, Acoustics, Mechanics.
a small circular disk, usually of mica, that is suspended from a fiber and tends to be deflected at right angles to a stream of air, indicating by its deflection the intensity of a sound wave.
Origin of Rayleigh disk
1910-15; named after J. W. S. Rayleigh Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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