Elementary natural philosophy : designed for high schools and academies (1881)
Griffin, La Roy F. (La Roy Freese), 1844-1916 · Philadelphia : Sower, Potts & Co. · leaf 110
roduce an audiblesound, all of these must be present. The term sound is also used conveniently for the undu-lations of the transmitting medium. It is so employed inthe following discussion. 343. That vibrations of a sonorous body produce sound can beshown by either of the following experiments.… … 100 ACOUSTICS. 344. Or, suspend several pith balls exact-ly in contact with an empty glass vase, Fig.128. Causing this to produce a sound,though the vibrations may not be suffi-ciently intense to be seen readily, the pithballs are always kept at a little distance. 345. To show the necessity of…
Physics
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