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PROCESSING EQUIPMENT 83
washing tanks are interconnected by a hole in the centre of the partition between the two tanks, and 2-inches from the top. Each tank is fitted with a stainless steel sheet, located in runners, to divide the tank effectively into two compartments. Since the steel sheet does not touch the bottom of the tank the water is caused to circulate in the following manner: It enters, via a water filter, the tank nearest the drying cabinet through a pipe let into the top right hand corner of this tank, then passes down the first compartment, across and under the steel partition into the second compartment, up this compartment and through the hole connecting the two tanks, and so into the second tank. A similar path is followed in this tank, and on reaching the last compartment, the water is fed from the processing tank into the heat-transfer coil in the main water storage tank. It should be noticed that the water flows through the tanks in the opposite direction to the path travelled by the film.
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Fig. 35. — Plan view of developing racks.
The Film Racks
Figure 35 shows a plan view of the top rollers of the first five racks in the developing tank. The lower bank of rollers are the first set over which the film travels on entering the developing solution. The first roller in this rack, that is, the roller shown at the bottom left-hand corner of Figure 35, is driven by friction only between the roller itself and its supporting shaft. This shaft is driven by a chain sprocket wheel engaged with a main driving chain which runs the entire length of the tanks. The second top roller, on the same shaft, is provided with sprocket teeth which en