Abstract: A photographic processing apparatus for uniformly processing roll film and photographic sheet material in a rolling stainless steel tank. The tank rolls back and forth along a platform that is tilted one way, and then the other, by means of an air bellows placed under one end of the platform. A mechanical air valve automatically shuts and opens to inflate and deflate the bellows. The apparatus can be placed in a constant temperature water bath. Electrical shock hazards are avoided since none of the electrical components are located in or near the water bath.

Abstract: A photographic easel that will allow the exposure of four equal sized photographic images on one sheet of any of the standard sizes of photographic sheet material. These exposures are made in rapid succession without moving the easel or without composing the photographic image between each exposure. The unique principle is based on a mathamatical relationship between the width of the photographic sheet material and the adjustable width of the working area. An adjustable bar allows for the use of various sizes of photographic sheet material.

Abstract: A photographic processing machine having a rotary drum into which the film being processed is placed, a fluid inlet and outlet so that the film may be treated with a plurality of processing fluids and a tilting mechanism for tilting the drum to drain the used processing fluid therefrom. The fluid outlet for the drum consists of a movable lid for one end of the drum which cooperates with compressible resilient seals to form a fluid tight enclosure at the one end. The fluid is drained by tilting the drum and then moving the lid from its sealing position. The processing drum has an electrical resistance wire wound about its exterior for maintaining the temperature of the fluid in the drum constant.