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THE STUDIO 211
or new sounds may be added to those already on a record. In fact, one may make any alterations of this sort which can be effected in the picture itself. The details involved in the operation offer no serious technical difficulties. The refinement of the disk and the extent of its future use is governed only by the demand in the synchronized motion picture itself.
IV. Outdoor Recording
A complete field or portable recording outfit consists essentially of microphones, a special amplifier containing a volume indicator, an A. E. O. light circuit, and a special sound camera. The last is operated by a 30-volt D. C. motor with rheostat control, drawing power from storage batteries or special spring motors, controlled by a governor similar to those of phonograph motors. The amplifier is operated by a 12-volt storage battery and a 400-volt dry cell B battery. The outfit is transported in a three-quarterton automobile truck and manned by a crew consisting of a camera man and a sound man. The apparatus has been simplified to such an extent that the recording work in most cases is being done by men having no special technical training. A number of such outfits are in operation at the present time, through the world, by divisions of the FoxCase Corporation, in photographing Fox Movietone News, a talking weekly. Incidentally it may be noted here that the wide-open spaces have been found to give acoustically ideal recording conditions. Where a portable outfit is not available, experiments have indicated that it is possible to pick up voices on location and to transmit the sound by telephone to the recording room at the studio. This procedure requires careful timing and the most accurate integration between the technicians' work on the scene and that performed by the men in the recording room.