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MANAGERS AND PROJECTIONISTS 995
be projected through it, and the section of sound track be moved through that line of light at a high rate of speed — ninety feet per minute, in fact — the black peaks being perfectly opaque, the amount of light passing through the sound track would be varied constantly, and in exact proportion to the height and width of the opaque, or if you prefer it, of the transparent peaks.
For example, at X and X, Fig. 385, during the time the transparent peaks are passing through the line of light it, the light, will reach the photo-electric cell at about seven-eighths of its full possible strength, hence the photo-electric cell will send out, during that infinitesimal fraction of a second, almost its full power in E.M.F.
On the other hand, at YY for the minute fraction of a second, about seven-eighths of the light will be shut off, and the photo-electric cell will only send out a very weak electrical impulse. From Z to Z many less pronounced modulations of light will occur, each of which will, of course, affect the electrical impulses sent out by the photo-electric cell, and therefore the amount of vibration set up in the loud speaker reproducer diaphragms.
Comparing Fig. 385 with Fig. 383, which latter illustrates the variable density method of recording and reproduction, it will be seen that the difference is so very marked that there is indeed but slight resemblance. However, the effect, in sound reproduction, taken as a whole, is not very different.
The variable area method of sound recording, as used by RCA Photophone, differs from other methods in that it employs two separate films for making the final record of sound and motion — one for the sound and one for the motion pictures.