Elements of natural philosophy (Volume 2-3) . Intensitydiminishes: 84 NATURAL PHILOSOPHY. Convergingsound; Intensity-increases ; Fig. 43. When in the progress of the pulse it retains its 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 willattain its maximum intensity ; for inthis position the living force, whichwas before distributed among the molecules o
Elements of natural philosophy (Volume 2-3) . Intensitydiminishes: 84 NATURAL PHILOSOPHY. Convergingsound; Intensity-increases ; Fig. 43. When in the progress of the pulse it retains its 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 willattain its maximum intensity ; for inthis position the living force, whichwas before distributed among the molecules of an ex-tended pulse, is concentrated in the few molecules of avery contracted Illustration ofdivergence andconvergence ofsound; Decreases inloudness beforereflexion; Increases afterreflexion: Maximumintensity.
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