Publisher's Synopsis
Excerpt from The Theory of Sound, Vol. 2
Arbitrary initial disturbance in an unlimited atmosphere. Poisson's solu tion. Verification. Limited initial disturbance. Case of two dimon sions. Deduction of solution for a disturbance continually renewed. Sources of sound. Harmonic type. Verification of solution. Sources distributed over a surface. Infinite plane wall. Sheet of double sources. Waves in three dimensions, symmetrical about a point. Har monic type. A condensed or rarefied wave cannot exist alone. Con tinuity through pole. Initial circumstances. Velocity-potential of a given source. Calculation of energy emitted. Speaking trumpet. Theory of conical tubes. Position of nodes. Composition of vibrations from two simwe sources of like pitch. Interference of sounds from electrically maintained tuning forks. Points of silence. Existence often to be inferred from considerations of symmetry. Case of bell.
Page Experimental methods. Mayer's experiment. Sound shadows. Aperture in plane screen. Huyghens' zones. General explanation of shadows. Oblique screen. Conditions of approximately complete re?ection. Diverging Waves. Variation of intensity. Foci. Re?ection from curved surfaces. Elliptical and parabolic re?ectors. Fermat's prin ciple. Whispering galleries. Observations in St Paul's cathedral.
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