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1949
FILM VAULTS
201
from entering the compartment in sufficient quantity for cooling purposes nor will it cause flooding of the film; there is ample space under its front part for drainage.
Fire and Water Baffles: Another means of protecting the front edges of the cans from cross fire consists of two hinged baffles, anchored at the front of the compartment as illustrated in Fig. 7. The lower baffle extends upward to a vertical height of approximately */4 inch and outward (into the vault aisle) at an angle of about 40 degrees. The two triangular spaces at the ends of this baffle are enclosed and the baffle is held in place by a spring. This spring permits it to swing downward when the can is being removed from or inserted into the compartment. The upper baffle hangs in a vertical position of its own weight. The two baffles, when in normal position, slightly
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FILM CAN
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Fig. 7 — Side-view elevation. A, hinges; B and C, baffles in place; B' and €' baffles open.
overlap, and thus protect the can from cross fire. The lower baffle serves the additional purpose of diverting water from the sprinkler heads into the compartment for cooling purposes; its limited height prevents flooding of the film.
The baffles may be opened, for inserting or removing the can, either by a simple bell-crank mechanism or by the use of the retractor belt. In the latter case, the shorter version of the belt is used as shown in Figs. 4 and 5. Its ring and about l/± inch of its tapered end are drawn through a slot in the lower part and one end of the upper baffle. About 6 inches of the front end of the belt is stiffened so that when it is pulled outward, it lifts the upper baffle and forces the lower baffle down. (See Fig. 8.) Both baffles remain open until the can is replaced and the belt pushed back into position.
Still another protection against the danger of cross fire is the use of half vaults; that is, films stored only on one side of the vault. In such a case, the cross fire from an affected compartment would strike