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Scientific American, Vol. 87, No. 15 (1902) (1902)
leaf 7
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 © 1902 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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