Abstract
Recently considerable work has been done, both theoretical and experimental on the transmission of electromagnetic waves through dielectric wave guides and hollow metal tubes. An analogous phenomenon is the propagation of transverse acoustic waves in gaseous media confined by rigid cylindrical tubes. Apparatus and methods are described for the production of some of the lower ordered acoustic waves and measurements are made with a tube of circular section filled with air. Measured values of wave-length, threshold frequency, and pressure distribution for some of the possible harmonic wave types are found to be in excellent agreement with theoretical values. Absorption measurements by the standing wave method in which transverse waves are used are suggested.
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