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THE PROJECTION ROOM 251
with seven feet for a one-projector installation, six feet are necessary for each additional projector, spot lamp, effect projector or dissolver and a reasonable allowance should be made for additional equipment in the future.
(26) Depth, from front to back wall, should not be less than ten feet where no .sound or other apparatus is to be installed along the rear wall. This provides approximately three feet of clear space back of the projectors, assuming them to be set as close as practicable to the front wall. Where equipment is to be installed against the back wall, the depth of the equipment plus any space required at its rear must be added to the regulation depth of ten feet.
Spacing the Projectors
(27) Since projection distance dictates the angle of the optical axis of each projector to the screen surface, the following is a safe rule to follow: if the projection distance is less than 75 feet the distance of the lens center of one projector to the lens center of the second should not exceed four feet. If the projection distance exceeds 75 feet but does not exceed 125 feet, the spacing should be increased to four and one-half feet. If the projection distance exceeds 125 feet, the spacing then should be increased to five feet, all distances measured from lens center to lens center.
Lens and Observation Ports
(28) The projector lens port wall openings should be at least 12 inches high by 10 inches wide. The area of these wall openings should be reduced later to just a little more than is necessary to accommodate the lighl beam. This reduction should be made after the projectors are finally anchored in place and the light properly centered upon the screen.
In Fig. 69 we see a lens port approximately reduced to the area of the light beam making the use of glass over lens ports unnecessary.