Quotation from: General Science

Written by: Bertha M. Clark


If a light cork ball on the end of a thread is brought in contact with
a sounding fork, the ball does not remain at rest, but vibrates back
and forth, being driven by the moving prongs.


[Illustration: FIG. 165.--The ball does not remain at rest]


These simple facts lead us to conclude that all sound is due to the
motion of matter, and that a sounding body of any kind is in rapid
motion.

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