Abstract
WE have devised a simple method of determining elastic constants of rocks which is based on the principle of the critical angle method employed by Schneider and Burton1. In this method a narrow beam of ultrasonic waves strikes the rock section immersed in a liquid at right angles to its axis of rotation, and the critical angles θd and θs for total reflexion of the longitudinal and transverse waves set up in the section are determined experimentally. Knowing the velocity of ultrasonic waves V in the liquid, the velocities of longitudinal and transverse velocities V d and V s in the rock section are determined by using the familiar relations,
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