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In extension of a previous paper, the piezoelectric behaviour of partially plated square plates vibrating in contour modes is used to check the theoretical solution for the motion. For the longitudinal mode 2 recently described by Ekstein a particularly sensitive test of the theory is possible. A critical electrode arrangement should cause the piezoelectric excitation to vanish. This is confirmed by experiment.
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Bechmann et al. (1951) studied this question.
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