Abstract
IF thin square plates of ethylene diamine tartrate have two sides parallel to the Y-axis, the axis of two-fold symmetry, so that the normal to the plate is in the XZ-plane, then there are two values of the angle θ between the normal and the X-axis which lead to zero temperature coefficient of the frequency of the contour shear mode. (The angle θ is measured from the positive direction of the X-axis towards the negative direction of the Z-axis.)
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References
Mähly, H., and Trösch, A., Helv. Phys. Acta, 20, 253 (1947).
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BECHMANN, R. Piezo-electric Resonator of Ethylene Diamine Tartrate with Zero Temperature Coefficient of Frequency. Nature 164, 190–191 (1949). https://doi.org/10.1038/164190b0
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DOI: https://doi.org/10.1038/164190b0
