Abstract: A peristaltic pumping system in which a length of elastic tubing connected at opposite ends to storage spools is advanced alternately in opposite directions through a pinch roll pair and in which opposite ends of the elastic tubing are connected in fluid communication alternately with pump intake and pump discharge conduits by a reversing valve. The valve is adjusted by means dependent on the direction of tubing travel through the pinch roll pair. The system is preferably incorporated in a cassette-like enclosure which may be removable received in a drive console. Alternately, the system may be self-contained in an enclosure adapted to be implanted in an animal body.

Abstract: A camera having first and second housing sections, each of which is adapted to receive a film cassette containing at least one film unit. The camera is of the single reflex type and includes a pair of opaque members each of which is mounted for movement between a first position wherein it overlies a film cassette thereby allowing the camera's lens and shutter assembly to remain open during viewing and focusing without prematurely exposing a film unit and a second position wherein the film unit is uncovered in preparation for exposure. The first and second housing sections are coupled together for movement between (1) an extended position wherein they define an angle therebetween and wherein either the film unit in the first or second housing section may be exposed and (2) a collapsed inoperative position wherein one of the housing sections overlies the other thereby enhancing the compactness of the camera.

Abstract: A reflex camera having a film chamber for supporting a film cassette having a film unit therein in position for exposure and a motor driven spread roller assembly mounted in position to receive an exposed film unit therebetween as it is being advanced from the film cassette and spread a processing fluid across an element of the film unit to initiate the formation of a visible image therein. During viewing of the subject through the camera's objective, an opaque shade or curtain having an exposure aperture therein is mounted between the objective and the film unit with the exposure aperture located out of alignment with the exposure aperture in the film cassette thereby preventing inadvertent exposure of the film unit during the viewing operation.