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Rayleigh disk

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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.
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Which of the following words means “to make a crackling sound; crackle”?
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Origin of Rayleigh disk

First recorded in 1910–15; named after J. W. S. Rayleigh
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

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