Tyndall, John, 1820-1893 · London : Longmans, Green · leaf 323
the gun ineffectual at lessthan half the distance deemed essential. The Map, fig. 156, which consists of a portion of fig.155 enlarged, will help us to an explanation of theseobservations. Near the fog-signal station a projectingchalk cliflf at C received the impact of the sonorous wavesand… … VARIATIONS OF RAXGE. 301 we have to account for the fact that the enfeeblement ofthe sound occurred not only inside but immediately outsidethe boundary, and while the instruments were in sight. Asudden subsidence of the sound was always observed oncrossing the boundary A B towards the shore, and a…
Sound
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