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recommended, and do still recommend an opening in the projection room wall 12 inches wide by 24 inches high, same to be covered with a sliding shutter, hung on a counter weight moving up and down at the will of the projectionist. In this false shutter there should be an opening ten inches wide by six high. By this plan, we have a port six inches high by ten inches wide, adjustable as to height over a range of 24 inches. Such a port shutter is illustrated. Figs. A and B. Its construction (too lengthy to be incorporated herein) is described in detail, pages 218 to 220, inclusive, Richardson's Motion Picture Hand Book for Managers and Operators. All lens and observation ports should be covered with glass, as already set forth. Lens ports should be no larger than is necessary to pass the actual effective projection ray.
Fig. C
Showing method of suspending individual shutters from one master cord. This may be and is done by means of patent devices which serve the same purpose, but are in reality httle or no better; in fact they may be not so good, since by their use the fuse link is almost invariably located a considerable distance from any possible seat of fire. As in this illustration it is the idea which is illustrated, its practical application varying with the individual installation.
Position of Projection Room: This is a subject so well understood that its discussion would be largely a waste of space, except to say that it should never be less than 50 feet from lens to screen, if a picture twelve feet or more in width is to be projected. Its permissible height above the screen has already been taken care of acceptably by this body.
Port Shutter Fuse Links: It is, of course, necessary that all ports be covered with shutters of fireproof material, so arranged that they will fall automatically in case of fire, and do so within a very Jew seconds of the starting of the fire; also, so arranged that they may be instantly dropped by the projectionist. The usual present practice in location of fuse links renders them of no practical value. I have for years recommended the substitution of links of film for metal fuse links, and have insisted that they be placed as closely as possible to every probable seat of fire. As I have repeatedly pointed out, it is imperative that the fire shutters drop within 5 seconds of the start of a fire, else they might almost as well be left up altogether. It is not the fire which works in
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