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~n apparatus for the i~vestigation of the piezoelectric coupling in granular powders is desc:·l!)ed. The a pparat us IS based on the method of Giebc and Schcibe but employs the senSIt Ive detectJOn an d r ecordll1g methods commonly employed in the study of nuclear quadrupole reso nan ces . Some sample r ecorder traces are shown. The traces indicate that t he apparat us is a workable quali tative tool with at least the possibility of some quantitative usefulness]

Apparatus for the detection of piezoelectric coupling