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This paper presents the results of calculations of the scattering of a plane sound wave from a prolate spheroid. Scattering patterns are given for the major axis equal to λ/π, 2λ/π, 3λ/π, for the ratio of axes equal to 0.10, 0.20, 0.29, 0.37, and for the angle of incidence measured from the major axis equal to 0°, 30°, 60°, 90°.

A rigorous theory of the diffraction of plane sound waves by circular disks and apertures is developed by use of oblate spheroidal coordinates. Numerical results for the cross section for scattering and transmission are given in graphical form.

A graph, showing a comparison of results with those of other investigators, is given.The value of the heat of reaction for the dissociation of calcium hydride is found to be 51,100 calories at 1100°K.A brief discussion is given of the mechanism of the reaction.Schenectady, N. Y.