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1950 RAPID FILM PROCESSOR 33
water temperature as long as the incoming hot water supply is hotter than the operating temperature. A panel thermometer indicates the hot water supply temperature and lights a warning light if necessary to indicate Subnormal Water Supply. The combined flow of hot and cold water supplies is 1J/2 gal/min.
The air squeegee housing contains two orifice blocks which direct air streams onto opposite sides of the film. The film enters the housing through a lower pair of rollers, spaced 0.008 in. apart, and leaves the housing through an upper pair of rollers, spaced 0.006 in. apart. Since the upper rollers provide no film clearance, the air stream is confined to the 0.001-in. clearance space under each lower roller. As a result, the air stream is in close contact with both sides of the film. The air stream bodily removes surface moisture from the film and carries it downward toward the sump. Each pair of rollers is spring loaded so that it yields to permit passage of a film splice, but does not deflect under normal air flow pressure. The housing may be opened for film threading.
Two 500-w infrared lamps heat the film in the drying chamber, driving moisture out of the film emulsion. An exhaust blower at the top of the drying chamber carries away moisture-laden air. Clean, dry air enters the console through filter panels in the side covers.
DELIVERY OF FINISHED FILM
Before the film leaves the drying chamber, it passes through a dip bath containing a solution of carnauba wax in carbon tetrachloride. It is generally recognized that films which have been waxed in this manner are more durable than unwaxed films. The film dries completely before it leaves the chamber, and the fumes are carried away by the exhaust blower. The film is then ready for projection.
As the finished film discharges from the processor it is either delivered to a projector or taken up on a storage reel within the side cover. One experimental type of side cover carries fittings for both methods of delivery. In addition to a take-up-reel spindle, it has a film storage elevator containing an isolating film loop. The maximum footage which can be stored in the loop is equivalent to 10 sec of running time. The main purpose of the loop is to permit simultaneous starting or stopping of processor and projector, allowing for a difference between the separate machine rates during the transition period.
A large-capacity film storage elevator is available which will permit as much as a 3-min delay between processor and projector. By use of this elevator, film can be monitored and edited prior to pro