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From the cleaning operation the film moves to one of two timing rooms, which has four timers in each room. Only one was in operation, with one operator and seven cans of film on hand. The process has a maximum of 5,000 feet per day. With eight people working 40,000 feet of film could be processed daily, and on-hand stock would probably be some 40 cans. Thus, a optimal cleaning operation would take two days to process one shipment.
The film then goes to the printing rooms, of which three of seven rooms are used for nitrate film work. This may involve three people and process 15,000 feet per day per room. Maximum probable film on hand would be 15 cans per room, assuming a one day float.
Between each operation, depending on the float involved, the cans may be stored in the shipping and receiving room, on open metal shelving.
Each day, according to NARS officials, all the nitrate film is removed from each storage or process area and placed in vaults. One set of vaults is named the "Baltimore" vaults, a set of six vaults capable of accommodating 25 cans each. The vaults have a stack vent connected to a common exhaust duct used to vent various machines and rooms processing the film (See Exhibit A) .
A secondary vault, a large walk-in refrigerator unit, is also used for nitrate film storage, although primarily maintained for safety film. This walk-in storage vault had 10 cardboard boxes of nitrate film, with approximately 10 cans per box.
Figure One plots the process flow in terms of cans per location. Without a detailed study, it is not possible to assess the actual flow, but the plotted flow indicates a potential of approximately 250 cans, largely located in the shipping and receiving area, with a maximum potential of 500 cans (if problems develop in the processing) . This equates with 1/4 to 1/2 of the contents of one of the Suitland storage vaults.