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PROJECTION ROOM PLANS AND EQUIPMENT LAYOUT
Upper left: Inside front wall elevation Lower left: Floor plan
Above: Section, exemplifying projection angle
shifted in such manner as to cause distortion of the screen image.
It is very important that the port openings in the front wall of the projection room be located and constructed properly. (I have observed many an instance in which they had to be re-worked at the last minute.) These
openings should have substantial iron lintels at the top, or be lined with heavy-gauge metal to prevent sagging or cracking of the wall.
The size of the projection port openings should be 10x10 inches, which will allow for any error in determination of the projection angle, movement of the screen from the
position originally planned, and the thickness of the masonry wall.
The size of the observation port openings should be either 10 inches wide by 12 inches high, or 12 inches wide by 14 inches high, with the bottom of these openings in line with the top of the projection port openings. This relation will permit better viewing of the picture on the screen from the projection room and thereby aid the porjectionist in maintaining sharp definition.
The size of the spot, effect, etc., machine port openings should be either 30 inches wide by 24 inches high, or 36 inches wide by 30 inches high, with the horizontal center line on the same horizontal center line as that of the projection port openings.
•
It should be remembered that the height of the projection port from its bottom to the projection room floor will vary according to the angle of projection. The height is around 391/2 inches at an angle of projection of 6° and with standard projectors. A workable method for determining the angle of projection is as follows:
First the lens pivot line should be laid out by drawing a horizontal line 48 inches off the projection room floor, and a vertical line 18 inches from the finished front wall of the projection room. This 18-inch vertical line holds good to a 12° angle of projection. Beyond a 12° angle this dimension will increase ! inch per degree of angle increase.
Now where these two lines intersect will be the center of the pivot on the projector. Three lines should now be drawn from this pivot line to the screen located in its proper location on the stage, one line going to the top of the screen, another to the center, and the third line to the bottom. The space between the center line going to the screen, and the 48-inch horizontal line will indicate the angle of projection. The top and bottom lines going to the screen will show the light beam area
250 West 57th Street New York 19, N. Y.
THE SERVICE ORGANIZATION OF THE MOTION PICTURE INDUSTRY
14
BETTER THEATRES, MARCH 3, 1945