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An autographic stress relaxometer has been designed and constructed for studying the relaxation of the stress of a polymer film elongated to constant length. The force-measuring element is a linear variable differential transformer which measures the distortion of a flexible steel ring and drives a recorder. The sample is elongated to the desired length automatically, and the correct length is maintained by means of a second differential transformer.
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Stein et al. (1948) studied this question.
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