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The directional variation of body wave velocities has been computed for cubic and hexagonal metals where stiffness coefficients are known; the essential data is presented in the form of tables and graphs. The results for aluminum, copper, gold, iron(α), lead and silver are tabulated in terms of the directional indices, and a stereographic coordinate system has been devised for presenting these data in the form of iso-velocity contours for the three wave vectors. The compressional and shear velocities for cadmium, magnesium, and zinc are plotted as a function of the angle formed by the direction of wave propagation and the hexagonal (c) axis from which have been derived the theoretical average velocities which may be compared with measured values for polycrystalline specimens.
Louis Gold (1950) studied this question.