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MANAGERS AND PROJECTIONISTS 979
in its variations, the sound wave frequencies, and is able to and does impress those variations upon the Aeo lamp circuit in such manner that the light brilliancy of the gas surrounding B, Fig. 382, varies in exact proportion, or in exact frequency with the sound wave frequencies.
It is very difficult for you and I to grasp the fact that such an action can be set up with such astounding perfection that all the vast number of sounds and sound combinations can be faithfully impressed upon the film sound band in photographic form, but the splendid results Movietone has shown is something more than abundant proof that it is so.
The hard thing to grasp is the fact that the brilliancy of a light source can possibly vary so fast, but the Aeo lamp is another product of inventive genius produced with exactly that end in view, and it does so vary, incredible as it may seem. The proof is found in the marvelous faithfulness with which sound is reproduced by this process.
Returning to the "slit," it is so placed and microscopically adjusted that it projects a line of light approximately one one-thousandth (.001) of an inch thick by one-twelfth (.080) of an inch wide upon the sound band, at precisely right angles to the length of the film, or to the edge of the film if that is more readily understood.
Remember that in the camera sound gate the film runs continuously, and this line of light is shining continuously upon the sound band, but with constantly varying brilliance. Of course you all know that the amount of discoloration upon any point of the negative film will, after development, be dependent upon the