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MANAGERS AND PROJECTIONISTS 1241
largely by local conditions. The main factors to be considered are type of equipment, size of theatre and projection angle. Fundamentally port requirements are very simple. The projection port should permit the projection of an image to any part of the theatre required of that particular projector.' In the case of the spot-lamps, flood-lights, stereopticon, and effect projectors, and at least one motion picture projector, this will include the entire front of the auditorium. The observation port should permit the projectionist to have full view of this area from normal operating position besides the projector in question. Satisfying these requirements is also a simple matter, but calls for careful checking of all dimensions. In some cases it will be necessary to cut the ports with their walls flaring outwards if the projection room walls be excessively thick.
The fundamental requirement of port shutters is that they surely, quickly and quietly close all ports within a few seconds of the inception of any film fire. We respectfully recommend the system of shutter suspension and semi-automatic control adopted by the state of Pennsylvania, or that employed by the Chicago division of Publix Theatres, Inc.
VENTILATION. — Projection room ventilation has two separate and distinct functions. First it must exhaust all of the hot gases from the arcs, remove foul air from the room, and maintain comfortable temperature at all seasons of the year. Second it must be capable of exhausting all fumes from burning film, in the event of a film fire, as fast as they are formed.
The first requirement is best met by two independent systems, one for the room in general, and the other directly connected to the lamp houses. In the cases of