he sounds emitted by the vari- ous sound - producers used. The instrumental tests were mainly de- voted to comparisons of efficiency between the siren principle and the reed principle of producing sound and between modified forms of each type. Two sizes of cylinder sirens were tried; one of 5-inch… … nal purposes under Siren-Trumpet and Reed-Horn. Lord Rayleigh's Trumpet in the Background. Lord Rayleifh's Trumpet. EXPERIMENTS AT ST. CATHERINE'S WITH FOG SIGNALS. ) 1902 SCIENTIFIC AMERICAN, INC.
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