Cine-film projection : a practical manual for users of all types of 16-mm. (1952)

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or otherwise interfere with them. They should preferably be slung at least seven feet above the floor. (g) The mains supply must be connected to a proper powerpoint, and never connected to the lighting circuit. If no powerpoint is available the mains cable should be connected to the fuse-box. (h) If possible, the bottom of the picture should be 4' above the heads of the audience and the projector lens 6' above the floor. The projector should not be brought within the seating area, except to clear the picture of shadows caused by low beams or other supports to the ceiling. (i) The volume of the sound from the loud-speaker should be in proportion to the size of the hall or room. A A A A A f 18 <4 6 6 MAINS .CA&Ll Fig. 23 "EVER-READY" CONNECTIONS FOR THE MOBILE PROJECTIONIST Electrical engineers may frown on this idea, but it will certainly save you a lot of time and allow you to connect the proper plug without having to use a screw-driver. But take care to use 10amp. flex connectors, 5 -amp. ones may not be sufficiently strong. (j) The loud-speaker should have sufficient height to clear any nearby obstructions, and unless the screen is a perforated 98