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VARIOUS APPARATUS 61
study of the fundamentals of the technique involved should not within a reasonably short time become proficient as the operator of a machine to project pictures and sound.
Let me make the interpolation, in passing, that, next to the sound-reproducing apparatus itself, one of the most important adjuncts to good results is the use of a screen that permits transmission of sound without sacrificing proper screen reflection. There are various screens being manufactured at this time that are designed to meet the situation. Yet even with the best screens now in use there is some loss of reflection power where the horns are placed behind the screen. This presents a problem that will in all likelihood be solved before long, for all technicians realize that the proper reflection of light is a matter of utmost importance. In the meantime the mechanic should give the matter his best thought.
It is furthermore desirable in the design of the projection room to eliminate to the fullest extent all vibration or foreign sounds which might make themselves felt because of the delicate reproducing apparatus.
An aperture mask is used when making the change from regular film to Movietone film. The necessity arises because the sound track of Movietone reduces the width of the picture, and cannot of course be permitted to appear on the screen. A compensating change in the lens is required, if it is desired that the masked picture be the same size on the screen as the silent picture.
Thus the experience and skill of projectionists must contribute a great deal to the proper manipulation and result. While in the beginning it was necessary to sacrifice visual imagery for auditory, at the present time the careful mechanician has at his command equipment that makes the deficiency unnecessary.
Improved methods of making change-overs from one machine to another have likewise been evolved, and now