Abstract: Photographic developing tanks are described of improved and simplified construction. In particular, the tank has a cylindrical base, the top of which can be closed off in light-tight fashion by a wide funnel member extending right across it. The funnel member fits into the base by a modified latching bayonet fitting constituted by cooperating formations on the inside of the walls of the base member near their top and on the outside of the funnel member.

Abstract: Frames are described which can be made by plastics moulding and in which the (usually) four sides and the backing plate are moulded integrally in a single moulding operation. The backing plate does not quite fill the aperture between the four sides so it can be manufactured easily by injection moulding. The frame is suitable for the receipt of a sheet article such as a sheet of photographically sensitized paper between the backing sheet and flanges on the (usually) three sides other than that to which the plate is attached.

Abstract: The invention relates to drum processing apparatus for in the treatment of photographic material. The apparatus comprises a stand, a processing drum rotatably mounted on the stand, and means for intermittently axially displacing processing liquid in the drum causing the liquid to oscillate axially in waves traversing the length of the drum. The drum is axially slidable relative the support. During rotation of the drum, it is variably axially displaced against drum biasing means to cause processing liquid in the drum to oscillate axially. The present apparatus, which is simple and convenient to construct, ensures uniform and continuous contact of the processing liquid over the photographic material treated in the drum.