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The equivalent electrical circuits of three bars in longitudinal vibration were measured at approximately 25, 52.5 and 80° C In this range of temperature the temperature coefficients of d 11 and d 14 are respectively -2 30 and +13 60 parts/million/° C, and there is no evidence to support Cady's suggestion that d 11 passes through a maximum near room temperature. The measurements suggest a rather high value for d 14 : (-2.21 ± 0 1) × 10 -8 cm/E.S.U. of potential at 25° C.
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A.C. Lynch (1950) studied this question.
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