Abstract
BY using a suitably cut and silvered quartz or tourmaline wedge, we have been able to generate continuously varying ultrasonic frequencies. This forms the basis of a new method for measuring the effective elastic constant of a given plate. In this method, the particular frequency for which there is best transmission through the plate is located by allowing the waves to pass through the plate into a liquid and observing positions of maximum intensity in respect of the usual Debye–Sears pattern. This frequency v is related to the effective elastic constant C'33 by the relation 4v2d2ρ = C'33, where d and ρ are respectively the thickness and the density of the plate.
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