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Jan., 1950.
LEVENSON I EXPERIMENTAL PROCESSING MACHINE
Fig. I . General view of machine
continuous treatment and which was sufficiently flexible and tenuous in strips of 35 mm. or less in width.
For the purpose of continuous processing machine design we wanted a pilot machine which could be used to specify the times of the separate operations before designing the prototype machine. For studying the chemistry of exhaustion and replenishment it was necessary to have tanks of small capacity and, in order to obtain long processing times when necessary in such small tanks, to have a range of speeds diminishing to about 3 inches per minute.
It was clear that no one machine could economically cope with such a wide range of functions. Therefore, instead of designing a machine, a collection of loose, interchangeable parts was designed so that any sort of processing machine could be assembled in a short time. Hence our so-called " machine " is really a sort of constructor's kit of continuous processing machine parts. A typical assembly of parts is seen in Fig. 1 .
In order to achieve maximum flexibility of arrangement, and to cheapen the construction, no driving effort was provided at any point in the wet end of the machine. The film is pulled through the tank assemblies by the drying unit. Since the tension in the film due to bearing friction increases by geometric progression each time the film passes round a bobbin, the friction is minimised by using ball bearings on all the non-immersed spindles.
The Main Frame
Provision is made to accommodate a maximum of eleven tanks because this