Rayleigh disk

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:
1910–15; named after J. W. S. Rayleigh
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Rayleigh disk is always a great word to know.
So is ninnyhammer. Does it mean:
a fool or simpleton; ninny.
a chattering or flighty, light-headed person.
WordNet
rayleigh disk

noun
an acoustic radiometer consisting of a light disk suspended from a quartz thread; when exposed to a progressive sound wave its torque can measure velocity 
WordNet® 3.0, © 2006 by Princeton University.
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