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CHAPTER IX. THE PROJECTION ROOM
(1) The projection room is the very heart of the theatre. It is the working place of men who are called upon to recreate the performance of great artists, both in pictures and in sound. (2) Whether the recreation is good or bad depends to some degree upon the appointments and general conveniences of the projection room itself. (3) Men engaged at tasks that require intelligence and skill cannot be expected to work efficiently in quarters that are badly ventilated, cramped or devoid of simple necessities.
Location
(4) In locating the projection room avoid projection angles, if possible, to eliminate distortion on the screen. The maximum angle approved by the Society of Motion Picture Engineers is 15 degrees. Laterally (sidewise) the room should be located so that where there are two projectors each projector will be located equidistant from a line at right angles with the surface of the screen at its center. Where there are three projectors the lens of the center projector should be on this line.
(5) The projection room should not be too close to the screen or it will require the use of a projection lens of less than 4 inches EF; nor should it be too distant, or it will require the use of a lens exceeding 7 inches EF.
(6) The use of a too-short focal length projection lens makes it impossible to secure sharp definition (focus) all over the screen, a condition that induces eyestrain. The use of a projection lens of more than seven inches EF may mean that not all of the light beam will enter the lens, resulting in loss of light and uneven
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