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Some features are described of an apparatus which measures internal friction of longitudinally resonant specimens at elevated temperatures. The apparatus uses electrostatic drive and frequency-modulation detection, and operates near 100 kc/s, at temperatures up to 1300° C. Limits of operation are discussed, and a comparison made of the observed amplitude-dependent loss at the specimen supports with a simple theory of frictional loss.
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P. D. Southgate (1959) studied this question.
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