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acoustic impedance acoustic interferometer Acoustic Resonator amplitude detection Angona apparatus attenuation calculated Chapter coiled tube condensor microphones confined gas Cornish and Eastman described determining the velocity diameter direct measurement distance driver dust tube Eastman 9 El-Hakeem 38 electrical impedance eliminate experimental free gas velocity free of systematic frequency ft/sec Gaggioli gases half-wave lengths Helmholtz inch indirect methods integral number interferometer kinematic viscosity Kirchhoff constant Kirchhoff equation Lissajous figure loud-speaker measured velocities measuring the velocity ments methods of determining mounted normal number of half-wave oscilloscope output phase angle piston plates precise probe rod produced receiver microphone reflecting devices reflector Romer shown in Fig signals sinusoidal sliding block smooth tubes sound chamber sound measure sound pulse sound reflecting sound tube sound velocity sound wave standing wave systematic error temperature and pressure theoretical total sound absorption transmitted variable geometry velocity measurements velocity of sound voltage water bath wave length