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A device which automatically maintains a torsional pendulum at constant amplitude oscillations is described. We have obtained a record of K δ against time ( K is a proportionality factor and δ is the damping of the pendulum) while the specimen is submitted to a constant maximum stress. For example, a Snoek damping peak is measured in this way and also by the classical method.
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Pérez et al. (1967) studied this question.
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