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MANAGERS AND PROJECTIONISTS 1193
Non-Synchronous Equipment
THE number of non-synchronous sound reproduction and projection devices offered the exhibitor is legion. I have heard the number stated as high as 2,000. They are of all grades, sizes, forms and kinds. No attempt will therefore be made to deal with individual apparatus, save insofar as seems necessary in order to convey a knowledge of the general set-up of such equipment. It is, however, the intent to convey a comprehensive idea of just what such apparatus consists of, and what the exhibitor may hope to accomplish with it.
Non-synchronous apparatus is really a sort of duplex phonograph, of more or less elaborate design. There may be two, three or even four or five turntables, though there appears to be slight advantage in having more than two, or at most three of them. In addition, there is an arrangement for the amplification of sound by means of vacuum tubes, with horns or loud speakers located in the vicinity of the screen. Some of these devices are designed to connect to regular synchronous sound apparatus, to the end that its amplifiers, etcetera, may be used to supply musical accompaniment for silent pictures, using records running at standard phonograph speed and therefore with all the great library of regular phonograph records to draw from, and with the various cueing devices available. Most of the others are so made that this sort of thing may be more less effectively done, or they may be used in theatres where synchronized sound apparatus is not installed.