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MANAGERS AND PROJECTIONISTS 301
which includes not only the construction of the room itself, but the shuttering of its ports and the providing of sufficient vent pipe area to carry away all the smoke and fumes of burning film.
(D) The projection room must have a very solid foundation, since the least vibration in the floor will inevitably produce vibration of the picture upon the screen.
(E) The projection room must be as nearly as possible soundproof, to the end that the noise of the projectors, the rewinder, and the motor generator set or transformer, as well as the conversation sometimes necessary between the projectionist and his assistant be not audible in the auditorium.
(F) The lighting of the projection room must be such that in case of trouble the room may be instantly and brilliantly illuminated, to the end that repairs proceed with maximum speed. The lighting must, however, be so arranged that the projectionist may either extinguish all lights, or else greatly dim the illumination by means of a switch located within convenient reach from his position beside either one of the projectors.
(G) The color of the walls and ceiling is important. The optically correct color for the interior of projection rooms is a non-gloss dead black, but where this is objected to a very dark bronze green or a dark brown or chocolate may be substituted with satisfactory results. The important thing is that the best possible view of the screen is had when the projection room is dark, and the darker it is the better will be the view of the screen.
(H) The projection room should be reasonably easy of access, preferably not opening directly into the auditorium. It should be reached by a stairway rather than by a ladder. If it does open directly into the auditorium, then the stairway or ladder should be surrounded by some sort of partition so that in case of fire the projectionist may leave the room without allowing a cloud of smoke to escape into the auditorium to terrify the audience.
(I) The projection room should be large enough for reasonable comfort, allowing not less than two feet in the clear behind the projectors, after they have been set far enough back from the front wall, so that the projectionist may pass between the lens and the wall, with not less than six feet in width for a single projector and 3 feet additional for each additional projector, stereopticon or spot light.