An Improved Developing Trough for Photographic Films.

摘要

7204. Pendred, L. St. L., and Houghtons, Ltd. March 25. Trays, dishes, and containers for r o l l films.-For developing the film from a spool, the spool is housed at the top of a long narrow trough 1, Fig. 1, the free end 12 is fastened, and the film is unrolled into the trough in a double layer by drawing the backing of the film through a light-trapped slit 14 in the lid of the spool housing 3, in a manner similar to that described in Specification 14,079/01. The trough has outwardly curved sides. The spool is mounted on a frame which may be detachable and consists of a plate 4, Figs. 1 and 3, with side wings 7 and flaps 8 to centre the spool. The free end of the film is gripped between the plates 4, 9 by a screw 11. The lid 5 of the frame is secured by the spring clip 6. The trough has light-trapped fluid inlets, and in the construction shown the inlet 2 is at the bottom of the trough, which is immersed in an outer trough 15 containing the developing or other liquids. The trough is more especially intended for the spools used in the cameras described in Specifications 28,464/07 and 14,489/08, having tension springs 17. For ordinary spools, an auxiliary spring brake is provided to prevent the film from running loose during unwinding.