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MANAGERS AND PROJECTIONISTS 1105
film traveled through the camera must be exactly duplicated in its speed through the projector, which is taken care of by the projector motor regulator (see "Motor Control Box," page 1127). The camera and projector speed is ninety feet of film per minute, or eighteen inches or twenty-four frames per second.
REASON FOR SEALING.— In order that the camera recording slit and the projector pick-up slit be precisely in register, and the slit precisely the right distance from the condenser and objective, and the whole assemblage at precisely the right distance from the sound band plane, the slit assemblage is microscopically adjusted and sealed in position. The necessary adjustment must be made with a specially constructed microscope. As the equipment is now designed, this adjustment cannot possibly be correctly made by the projectionist. Any necessary adjustment is a service engineer job. The projectionist must not disturb the seal under any conditions.
If you will consider the matter for a moment, you will see that if tVe camera slit is in proper position when the record is made, as we may assume it always will be, and the projector pick-up slit be rotated ever so little, then the two will not register, and since the camera slit does not register the same thing (unless the sound happens to remain at exactly the same value for a period of time) at any two points of the sound track length, even though separated by only one-thousandth of an inch, it follows that such rotation would cause a blur in the sound in proportion to the amount of the fault. Also if the sound assemblage barrel be displaced laterally ever so little, there would be injury done to both the volume and the quality of sound.