Elements of natural philosophy (Volume 2-3) (1850)
Bartlett, W. H. C. (William Holms Chambers), 1804-1893 · New York : Barnes · leaf 93
Illustration ofdivergence andconvergence ofsound; Decreases inloudness beforereflexion; Increases afterreflexion: Maximumintensity. … § 77. To illustrate, conceive a disturbance to take placeat the focus F, of an ellipsoid ; apulse will proceed from thispoint in all directions. Any tworays, as FD and FE, will, fromthe law of reflexion just explain-ed and the geometrical propertiesof the ellipsoid, pass to the otherfocus F\ as…
Mechanics · Acoustics · Optics
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