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340 RICHARDSON'S BLUEBOOK OF PROJECTION
down from the ceiling, should all be painted a gloss white color. All other wall surfaces should be a dark olive green or dark brown color, except a strip 18 inches wide, in flat black color, around the observation ports and around the metal surfaces of the port fire shutters.
Enough incandescent lamps should be installed in the cove to provide a reasonable amount of illumination during projection. Fig. 142 will show that all of those lamps are completely concealed from view of the projectionist except when he is near the rear wall. We also see that all light comes in difTused form from the rear of the ceiling and from the top of the rear wall, falling upon the back of the projectionist and not upon his eyes when he is in working position beside the projector. The rear of the room can be well illuminated. The only possible objection to this plan is that the equipment will throw shadows on the front wall, but this is of little importance. Projectionists who have used this lighting system prefer it above all others.
The lights in the cove provide sufficient illumination in the projection room at all times for all requirements. Provision should be made in the cove for a secondary circuit to give brilliant illumination when projection is not in progress. The use of this second circuit should be severely prohibited during projection.
Trouble Lamps
When trouble occurs at one of the projectors ample illumination should be concentrated there. (45) For this purpose every projection room should have at least one reel-light; in large rooms two or more reel-lights should hang at convenient points. (46) A reel-light is a lamp at the end of a long cord which is wound on a reel mounted on the ceiling. The lamps can be carried to any part of the room and to every piece of equipment. (47) The reel is spring-controlled, so that the cord will automatically rewind itself and remain out of the way until the lamp is needed. Reel-lights may be bought from any first class supply dealer.