Introductory course of natural philosophy for the use of schools and academies. Ed. from Ganot's popular physics. By William G. Peck (1869)
Ganot, Adolphe, 1804-1887, Peck, William Guy, 1820-1892 · New York A.S. Barnes · leaf 171
. But the fact is, that sound is transmitted in all directions, whichwould indicate that its effect should be attributed to a reinforcementof the voice by the vibration of the column of air contained in thetrumpet, according to the principle that sound is reinforced by anauxiliary vibrating body. [… … Fig. 110. It is simply the speaking trumpet reversed. It serves tocollect and concentrate the sound-waves, which are thusenabled to produce a more powerful impression on the drumof the ear. The shape of the ear in man and in animals idsuch as to perform the function of the trumpet. II. —MUSICAL…
Physics
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