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Experimental results are presented for the directions of energy flow for transverse ultrasonic waves propagated along and near the Z axis of quartz. Measurements made with an absorption-probing technique as a function of frequency in the range 12–360 Mc/sec demonstrate the considerable variations in the spread of energy for slightly off-axis propagation. The use of plane-wave “Christoffel” solutions to obtain a qualitative picture of conical refraction is discussed in some detail. In general, the features of Waterman's analysis are confirmed [P. C. Waterman, Phys. Rev. 113, 1240–1253 (1959)].
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McSkimin et al. (1966) studied this question.
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