The Theory of Sound, المجلد 2

amplitude angle aperture approximately arbitrary axis calculated centre coefficient condensation condition constant corresponding Crown 8vo cylinder denote density determined differential equation dimensions direction distance disturbance divergent dr² e-ikr effect energy equal expression finite fluid function Green's theorem harmonic HELMHOLTZ'S THEOREM Huyghens inertia infinite integral intensity kinetic energy medium normal velocity obtained open end P₁ P₂ phase Phil pipe piston pitch plane waves plate potential pressure problem propagation quantity r₁ radius rarefaction ratio reflection refraction resonator result satisfied shewing simple source solution source of sound sphere spherical spherical harmonics suppose surface symmetrical term theorem theory tion tube vanish velocity of propagation velocity of sound velocity-potential vibration wave-length zero аф кс