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RECORDING SOUND ON DISC 445
quencies, as a result of which the needle tends to bridge over the high frequency modulations on the wax just as the finite width of the slit used in the film reproducing equipment tends to integrate over the higher frequencies with consequent loss of volume.
The combination of the recorder and reproducer characteristics with this latter effect represents only that portion of the overall frequency characteristic of sound pictures which is contributed by the actual recording and reproducing processes. It does not include such important effects as the acoustics of the stage, the characteristics of the microphone, the amplifiers and the horns and the acoustics of the theatre. Any attempt to compensate for the recording characteristic alone would be worthless. On the other hand, the characteristics of the recording system as a whole may be readily adjusted to produce the most pleasing final result in the theatre.
To the low cost of wax negative stock and the needed "prints" or finished records for studio work may be added the important advantage of simplicity of handling. Playing the records in the studio involves devices which almost everyone understands sufficiently to operate intelligently, and which can be readily duplicated throughout the studio to whatever extent is desired. For many purposes a phonograph, modified only as to turntable speed, is sufficient.
In actual recording on the wax disc, practically everything that might affect quality is disclosed during the recording period or immediately afterward by visual inspection of the wax. This is well demonstrated by the fact that much less than one per cent of the records which are processed prove unsatisfactory from a recording standpoint.
The disc recording machine has usually been regarded as a stay-at-home machine, resting comfortably on a vibrationless foundation with carefully controlled temperature, dust free air and other highly special conditions. This is certainly the opposite to a desert location set-up with temperatures well above a hundred degrees, and a truck body as the home of the machine. Many records have been made on location under such conditions, with results not distinguishable from studio records. This is a good example of adaptability of disc recording to special conditions.
The cutting of talking pictures represents the most difficult