This unit is essentially for the professional recordist and those specializing in the scientific investigation of sound phenomena. The tape drive mechanism incorporates a number of new features but the one that offers a truly unique facility is that of a continuously variable speed control, which permits the positive setting of any tape speed from 3.75 inches to 8.50 inches per second while stationary or in operation. This feature allows recording and/or playback to be made where the supply voltage is below normal, permits accurate musical pitch to be obtained, or to slow down the tape for analytical purposes, for example, for strain gauge vibration recording both in the air and on the ground, on radar research work, in hospitals for heartbeat recording and associated phenomena, and by the film industry where the variable speed has found application for dubbing sound on to film.: An illustrated description of the drive and a demonstration of the tape recorder itself will be presented.
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