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In preserving school-films of celluloid every possible precaution must, of course, be taken, supposing that the films are to be kept on the school premises. This should, on principle, be avoided; a film-store is in any circumstances a source of risk, and such risks should be excluded from buildings where children congregate. Many schools therefore have ceased to keep their own films, but obtain them from a central distributing depot or store. Here the films are kept as they should be and lent to schools one by one as they are needed; they only remain a short while in the school buildings and are returned to store immediately aftei use. Another advantage of this arrangement is that there is no need for each school to procure its own films, since a central film archive can serve a wide area and, on previous notice being given, every teacher can obtain from any large collection the particular teaching-film he needs. The most detailed existing regulations for the storing of celluloid film are those embodied in the Rules issued by the German X-ray Society for the safekeeping of celluloid X-ray films and those of the National Fire Protection Association (International) issued in respect of Photographic and X-ray nitrocellulose film. Although these regulations in the main envisage X-ray film, their principles apply equally to the storage of celluloid cinema film and they foim the basis of the following specific proposals for film-storage.
In whatever way films are stored, there are always certain general provisions that have to be laid down.
i. Smoking. No smoking must be allowed in any rooms where films are kept and " No Smoking " boards should be prominently displayed near the entrance. Further, in rooms not used for storing no one should be allowed to smoke who is engaged in handling film.
2. Fire extinguishers. A reliable water or lather fire-extinguisher should be placed in the immediate vicinity of every film-storage room.
3. Light. Storage rooms must only be illuminated by daylight or electricity. No direct sun-rays should be allowed to enter through the windows (frosted glass, etc.) (1). The electric plant must conform to the national regulations governing premises on which there is danger of explosion. Switches and fuses must be covered. The bulbs must be suitably encased in an outer globe or in wire. The use of portable lamps with flexible cord is to be avoided. A naked flame must in no circumstances be permitted.
4. Heating. Films should be kept not less than two feet away from hot-pipes, chimneys and other sources of heat. Pipes which can develop a temperature of over ioo° Centigrade should be covered with insulating material.
5. Destruction of waste film. It should be forbidden to destroy wastefilm; such film should be sold to the special dealers.
(1) Celluloid film was known to catch fire in a surgery by the passage of the suns beams through a carafe of water, which, acting as a lens, refracted the light on to a sheet of film lying exposed on the table.