Ray'leigh disk"

Acoustics, Mech.
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.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

RayleighRayleigh scattering
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