Abstract
The theory of the method employed is given, and various theoretical problems concerning Rochelle Salt piezo-electric resonators are described and discussed. The problems discussed include those relating to the orientation of the resonators with respect to the crystal axes and the correction of the simple frequency formula for finite lateral dimensions, secondary electrical effects, and adiabatic conditions. The correction for finite lateral dimensions is considered in detail, and the result applicable to the general case of a rectangular parallelepiped of crystalline material is given.

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