A method is presented for determining the coefficient of sliding friction between stylus and record groove. The method consists of measuring the time intervals required for a freely rotating record (on a turntable) to decelerate from one known speed to another, both with and without a stylus sliding in the record groove. The method as been used to evaluate the frictional characteristics of several brands of phonograph records in mind condition and after treatment with various preservatives, cleaners, and antistatic agents. Some test results are presented.
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