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FILM VAULTS
203
itruction and installation problems. The uninsulated or walercascade cabinet, which is the more economical to install, will be as a typical solution to the problem posed.
The basic principle of the water-seal cabinet, stated briefly for the convenience of the reader, is a diversion of heat from the storage area of the cabinet into a common flue, and the introduction of water into the cabinet where it flows over, under, and around each film can. The source of the water is an automatic directional spray-type sprinkler head. Each film is stored horizontally in a metal can, and in a separate compartment that is vented to the common flue. The cabinet can be designed for either 1000 or 2000-foot reels of film and for as many of each as needed in either the 35-mm or 16-mm size.
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Fig. 9 — Side-view elevation. A, cabinet flues; B, water-supply line. For the sake of illustrating the construction problem under conleration, however, a cabinet that will hold 24 1000-foot, 35-mm jls is cited. It consists of a 4-inch drain base, a 72-inch storage ;tion, and an 8-inch hood containing the water sprinkler. The overheight is, therefore, 84 inches. The topmost can is 76 inches from 3 floor, or within easy reaching distance without the use of a foot)1 or ladder. The installation of this cabinet requires either a hung tiling, or a conduit over each row of cabinets, into which the upper part of the flue is inserted. Fig. 9 shows a side view and Fig. 10 shows an end view of such an installation. Fig. 11 shows a ceiling plan with the use of conduits. Fig. 12 shows an enlargement of a hood near the juncture of the ceiling or conduit.