The elements of natural philosophy : copiously illustrated by familiar experiments and containing descriptions of instruments, with directions for using : designed for the use of schools and academies (1856)
Sprague, A. W. (Alfred White), 1821-1891 · Boston : Phillips, Sampson & Company · leaf 154
this means the sound ofbells rung at St. Salvador was heard on the deck of a vessel onehundred miles distant.* 121. The Sjjeakiiig- Trumpet. — This is an instrument em-ployed by commanders of vessels, generals of armies, and *Arnotts Physics. Upon ■what do the number of echoes from a surface depend… … 148 MUSICAL SOUNDS. others, for transmitting their orders during the noise of thetempest, or the din of battle. The rays of sound, proceedingfrom the mouth when applied to the trumpet, instead of diverg-ing and being scattered tln^ough the surrounding atmosphere, are reflected from the^^ ^^^ sides…
Physics
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