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90 Transactions of S.M.P.E., May 1924
moisture from the film after washing by a similar means as shown by Mr. Hubbard, except he reversed the process and sucks off the water by creating a partial vacuum inside a tube nozzle, and the outside air passing through the narrow slot with the film sucks off all surplus water, this is very effective. He then loops the film down several 25 ft. tubes, a roller weight keeping the film taunt, and dry air is forced up these tubes until the film is nearly dry; it is then completely dried and conditioned by being looped on a mechanical frame in an open room, where control is maintained on the air humidity. This system is very effective providing the defect of the film getting in contact with the side of the tube is overcome. Two methods are used on the multiple loop or tank system. One is by cabinets; (Fig. 1) in this case the film passes by an air nozzle which blows all surplus water back into the last wash tank, (La wley having a patent on his vacuum system) and the film enters into a teak cabinet through a narrow slot at one end, the cabinet being 4'6" long, 20'' wide, and the total height of the room. Double doors closely fitting and glazed run nearly the whole length on each side, and a partition in the center, also glazed but with a 6'' opening at the bottom, divides the cabinet into two compartments. Dry air, which is obtained by drawing it through linen bags and passing it over steam radiators, is fed into the top of the wet film side of the cabinet, the amount of such air being controlled by a valve in the duct, and this air passes down and up the dry side and exhausts at the top. 26 loops in each compaitment, each loop being about 18 ft. of film, gives about 800 ft. capacity, the average speed of the film being 25 ft. per minute. It is considered that the air is sufficiently humid after passing through the wet department, to supply the necessary humidity to the dried film. ' The defects are: insufficient room for ease of manipulation should a break occur; difficult to control the drying to the varying speed of the machine (such machines being varied for speed to comply with developing conditions) and it is not ideal from the fire risk end. These defects were considered by Mr. W. Jeapes and myself, and the following drying plant was evolved and has now been erected by me in a War dour Street plant. The surplus water is removed in exactly the same way as before, but the whole of the eight drying units are open and installed in one room especially tiled, and all mechanical parts are enamelled white so that the whole room and plant can be washed out by hose pipe. The film comes through the floor from the wet departments and long ducts for it to pass through make it impossible for lighted film on either side to get through. The whole of the mechanical parts (Fig. 2) and the support for the film is on a 4"X4''X3/8'' ^'U" section girder, 11%" long, one end being inserted in rear wall and 3"X3"Xi" ''T" support from floor to ceiling carried the other end, and also carries the vertical driving shaft which is coupled to the wet sectio-n 'by gears and clutch. This shaft drives by means of spiral gears, a lay shaft running the length of the ''U" girder and spur gears on same supply the rotation of four sets