Elements of natural philosophy (Volume 2-3) (1850)
Bartlett, W. H. C. (William Holms Chambers), 1804-1893 · New York : Barnes · leaf 93
s spheri-cal shape, but any portion of it be-comes so modified as to present itsconcavity in front, the rays will meetat some point in advance, and aresaid to converge / the sound will be-come louder and louder as it pro-gresses, and finally, when it reachesthe point of union of the rays, it… … Illustration ofdivergence andconvergence ofsound; Decreases inloudness beforereflexion; Increases afterreflexion: Maximumintensity.
Mechanics · Acoustics · Optics
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