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HOME RECORDING EQUIPMENT 39
for indicating when the sound applied to the microphone is just sufficient to produce good recording. In most equipments the proper recording level has to be determined more or less by trial and error.
In the Pam-O-Graph this is accomplished by means of a Neon light which in ordinary vocal recording should glow at the peak of the voice. If no glow appears the sound is insufficient, while if the glow entirely covers the bulb sound is too loud. Actually the proper level of recording is indicated by a sort of nickering action.
The Sampson Electric Co. are pressing this apparatus for
Fig. 20. Trugraph Recorder
business and for educational purposes, thus bringing a rival into the field of dictating machines.
The Trugraph Recorder. The Trugraph recorder, a product of the Astatic Microphone Laboratory of Youngstown, U.S.A., is another American recorder employing plain aluminium discs. Again, the apparatus has been designed specifically for the work.
Fig. 20 shows the general arrangement of the motor board, where it will be noted that the recording head is traversed across the disc by a lead screw which is held firmV at both sides of the turntable, and not pivoted in the middle as is the case with most British machines. A special clamp is provided for holding down the record blank. The usual type of carrier disc is not employed in this machine, since the turntable is made flat.
A particular feature of the Trugraph recorder is that it employs what is known as a " crystal " recording head, which was developed for recording on metal, and operates on