Abstract: Exposed photographic or X-ray film is agitated in a warm leaching bath which causes the silver-bearing emulsion to be removed from the film's plastic substrate in the form of a liquid concentrate which is cycled repeatedly through a first electrolytic extractor the cathode of which collects silver granules of approximately 80%-90% purity. The granules are collected and ball milled to approximatley a twenty (20) mesh consistency, and are transferred to a dilute nitric acid bath which converts the silver to a silver nitrate solution. When the solution of a silver nitrate has a neutral pH, it is filtered and subjected to a second electrolytic process which produces silver having a purity of approximately 0.999 fine.

Abstract: In the illustrated embodiment a hollow armature core is rotatably mounted in a water main, and is caused to rotate by water pressure applied against flexible sensing vanes, which are affixed in an axial bore in the armature core. Rotational speed of the armature is determined by the flow rate or pressure of the water in the main, fluctuations in such pressure causing corresponding flexure and angular variation in the vanes, thereby to effect rotation of the armature at a constant speed. The generating unit incorporating the unique rotor becomes an integral part of the existing closed water conveyance system.