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STANDARD SOUND DEVICES 47
speakers, so that the management may address the audience; and public speaking address systems, which may be installed in the waiting halls for either the transmitting of music or the making of announcements.
The reader must already have drawn, from even these few pages, certain inferences — if, indeed, he has not been moved to exclamation. Although we know that we are dealing with a very new thing, the record reads more like that of a business long established. The contemporary partnership of science and commerce makes the creation of a new enterprise a matter of mere months. As skyscrapers spring from excavations while one is out of town, so a brand new business, overnight as it were, takes its place in the market, complete in organization, stock, promotion, and even advertising literature. Of course, the general phenomenon is no new one. That it applies here must come to the average man as an eye opener. Such is my secondary intention. Perhaps the surprise will grow as I proceed to my next subdivision, and the ones following that!
III. R. C. A.-Photophone
The R. C. A.-Photophone is a result of research and development in the laboratories of the General Electric Company in association with the Radio Corporation of America and the Western Electric and Manufacturing Company. It is a photographic recording and reproducing system invented by Dr. C. A. Hoxie of the General Electric Research Staff.
The Photophone marks the sound trackwith an irregular divisional line, which charts the sound and thus leaves part of the sound track transparent. A ray of light strikes the exposed portion of the sound track, reproducing the sound that is recorded on the film. The amount of light that passes through the sound track is regulated by the