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Jan., 1950.
LEVENSON : EXPERIMENTAL PROCESSING MACHINE
submerged roller (Fig. 4) being carried on the end of a channelled rod, which may be lowered to any depth, and is set over at an angle to fit best into the bottom of the loop of film. Since the direction of this angle depends on whether a given tank is to be used in an " odd " or " even " position in the assembly (counting from the drying cabinet end), there is an alternative socket to hold the supporting rod. This alternate positioning of the lower roller supporting rod is evident in Fig. 1.
It is important that, on the wet side at least, the film is not threaded through any closed circuits that do not allow it to be removed sideways, so that tanks, etc., can be removed without requiring the machine to be re-threaded. It will be seen that if two adjacent tanks are removed from the system the two loops then unravel to give a straight untwisted strand. This factor facilitates threading up ; and if experiments are being carried out which require the removal or addition of a treatment, the tank assembly is so arranged that two adjacent tanks are affected, thus making it convenient for the film to pass through them in two loops or over them as a straight strand.
If the machine is to operate, as ours is, in an air-conditioned building, very
Fig. 4. Top view of one of the standard tanks hHBBHHH showing the method of holding the immersed roller. On the underside of this roller is a
guard strip that prevents the film from Fig. 5. The pull-off roller
falling away and becoming de-railed in case of a slack loop
little need be done to achieve temperature stability at the room temperature. Experience has shown that air-agitation of the solutions is very effective in producing uniform results and produces very little change in the performance of developers as the result of autoxidation in a day's work. Because of the small capacity of the tanks we have made no attempt to save developer from day to day, preferring to use fresh for each day's work.
Squeegeeing
A vertical rod is attached to the tank-rack at the drying end and various types of film wiping devices can be fixed here using ordinary laboratory clamps. As part of the kit we have an air-squeegee, a suction box and a rubber finger squeegee.
The air-squeegee is usually used because we have compressed air laid on as a factory service. However, our experience indicates that, when power is limited, the most efficient way of completely removing the supernatant water from 35 mm. film moving at speeds up to the machine's present maximum of 15 feet per