Gramophone Records of Acoustic Analyses

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    AT a meeting of the Physical Society of Sheffield held at the University of Sheffield on Feb. 11, a number of special gramophone records prepared in the Bell Telephone Laboratories, New York, to illustrate certain phenomena of hearing, were demonstrated by Dr. W. H. George. In the preparation of the original records the usual electrical process was used to convert the sound-waves by means of a microphone and amplifier into fluctuating electrical currents which, in passing through an electromagnetic recorder, operate the stylus cutting the ‘wax’. In addition, electric filters could be switched into the circuit so as to eliminate effectively known frequency ranges.

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