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MANAGERS AND PROJECTIONISTS 293
The Projection Room
THE projection room may properly be described as the heart of the motion picture theatre, since from it comes at least the major portion, and in some cases all of the entertainment provided by the theatre.
In the beginning of the industry the practice was to house the projector in a more or less flimsy enclosure, of the smallest possible dimensions, unventilated and located anywhere space could be found which had no possible value for any other purpose.
Of late, however, thanks at least in some measure to the work of the handbook and the projection department of Moving Picture World, exhibitors are beginning to understand something of the importance of a well constructed, commodious, well ventilated projection room; also that unless the same be so located that the projection lens will be central with the center of the screen, distortion of the picture and other evils will inevitably result; see Page 253.
LOCATION. — As has been explained under "Keystone Effect," Page 253, a location of the projection room which will produce a heavy angle of projection will not only result in distortion of the picture outline, but also of everything within the picture itself, and while it is possible to correct the outline .distortion insofar as has to do with making the sides of the picture parallel, the distortion of objects in the picture itself can only be remedied by changing the angle of projection, which in practice means changing the location of the projection room.
In considering this matter the exhibitor and projectionist should understand that it is the angle which counts. This means that distance of lens from screen is a big factor in the matter, as is shown in Fig. 75, in which the height of center of projection lens above center of screen is the same in all cases. The 40-foot distance gives a 32 degree angle, the 80foot distance only an 11 degree angle, while if the lens be moved back to 120 feet the angle would be only 7 degrees. This teaches us that if the projection distance be short, it is necessary, if the distortion is to be confined within a given permissible limit, that the height of the projection lens above