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Scientific American, Vol. 77, No. 11 (1897) (1897)
leaf 8
is completely shut in by|as the sound is received from the other vessel. Then, |trate with that of the fergusonite earths (left after the adense fog. To lessen the danger which then exists, | if they are five miles apart, each will whistle every |removal of Pp) does not behave ‘at all like the… … ballast, t he bell vessel is out of the rises to the sur- middle of the face itself. channel. For ves- © 1897 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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