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PRINCIPLES OF CINEMATOGRAPHY
Fig. 44. — Film safety locking device.
over the sprocket wheel, and under the lower guide roller. This arrangement is clearly seen in Figure 44.
The film is then taken up to the nearest of the top bank of rollers on the feed elevator. It is fed over the roller from the left and downwards to the right. The leading edge of film is then brought down to the first of the lower bank of rollers in the * Feedelevator'. It passes under the roller from the right and up again from the left. This process is continued until all the rollers on the elevator have been threaded. At this stage the leading edge of film will be passing over the last of the top bank of rollers. Level with this roller is a small aperture in the back panel on which the elevator is mounted, and the film is passed through this opening towards the processing tanks. The first rack in the developing tank is then raised and attached to the first hook on the cross-bar mounted above the tanks, this condition being shown in Figure 45. The leading edge of the film is then brought through the aperture and over the first of the top bank of rollers in the first rack, as seen in Figure 46. The film is then threaded into the rack in spiral form until it is completely filled, as seen in Figure 47. At this stage the leading edge of the film will pass over the last of the top bank of rollers.
The rack is then lowered into the supporting bearings on the main frame, and the sprocket is engaged with the main driving chain. To load a second rack it will be necessary to drive the main chain and so rotate the top shaft in the rack which has just been