A New High Speed Level Recorder
P. V. Bruel, Uno Ingård · The Journal of the Acoustical Society of America · 1949
A high speed level recorder of the “potentiometer type” which is useful both for laboratory and field measurements is described. The recording system consists of a moving coil with translational motion, the speed of which can be varied with a maximum value of about 1000 db/sec. Recording is made by a steel stylus on waxed paper of the same kind as that in the usual Neumann recorder.