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PRINCIPLES OF CINEMATOGRAPHY
Fig. 42. — Lower rack in film drying cabinet.
the top section of the cabinet comprises six free rollers and one fixed roller, pinned to the shaft and fitted with sprocket teeth. The top shafts are driven by an endless chain positively connected to the main driving train serving the entire machine. The arrangement of roller distribution is similar to that in the processing racks, i.e. the first roller over which the film passes on entering the cabinet is free, being driven only by its frictional contact with the rotating shaft supporting it. The second roller is the one fitted with sprocket teeth and is positively driven by the shaft. The remaining five rollers are all free to rotate by frictional contact only.
The lower racks are shown in detail in Figure 42, and consist of cantilever castings which are supported in guide channels at the rear of the cabinet. The cantilevers are fitted with ball-bearings to ensure their smooth travel along the guide channels. All the rollers in these lower racks are free to rotate about fixed axles.
The ceiling of the left hand compartment of the cabinet is cut away to provide an inlet through which hot air is drawn by the circulating fan. In a similar manner the ceiling of the right-hand compartment is cut away to connect this section of the cabinet with a ducting, at the opposite end of which the fan is mounted. Suitable controls are provided whereby the amount of heat employed may be varied to suit the prevailing conditions. Provision is made in each section of the drying cabinet to house a safelight mount into which may be fitted the appropriate grade of filter suitable for use with the film is question. It should perhaps be mentioned that the use of safelights at this end of the machine is only necessary when the entire machine is so compact that it is all housed in a single room. The larger machines are usually housed