Abstract: A radiographic apparatus for facilitating insertion of a radiographic element on a carrier into the retractable opaque envelope of a film unit for exposure purposes, and for facilitating its later removal, includes a housing having a light tight chamber for receiving the carrier and film unit arranged in superposed relation therein. When the housing is in an upright loading position and the envelope is retracted, gravitational force urges the carrier into contact with the negative sheet so that both are enclosed when the envelope is moved back to its closed position. During removal operations, the housing is inverted, allowing gravitational force to urge the carrier away from the negative sheet so that the envelope passes therebetween when returned to its closed position, leaving the carrier outside of the envelope.

Abstract: This invention is directed to a novel teaching apparatus for exposing and fading visual stimuli, e.g., shapes, letters, symbols and the like, and to novel methods for teaching and/or reinforcing the perpetual-motor learning process.

Abstract: A cassette that holds a large format photographic film unit of the self-developing type in a film plane for exposure to x-rays has a generally rectangular housing and a pressure plate disposed in the housing. The walls of the housing are in fixed relation to one another. A variable gap film-loading opening is defined at one transverse end of the housing and a second variable gap opening is provided at the opposite end for sliding removal of an opaque envelope surrounding the film unit. Springs resiliently urge the pressure plate into intimate, continuous contact with the film unit which also places the photosensitive layer of the film unit in intimate, continuous contact with an x-ray sensitive phosphor layer disposed adjacent the film plane. Operating members such as spring-loaded slide rods mounted in the longitudinal edges of the cassette are operatively connected to the pressure plate through one or more cam surfaces.

Abstract: A photographic sheet positioner, which releasably mounts on a film processor, releasably holds a print sheet in a predetermined location in a slide tray and guides a photographic cassette along a path to feed an image-bearing film sheet therein into aligned engagement with the print sheet. A locator applies a selectively-releasable resilient locating bias on the two inter-engaged sheets in the slide tray. When mounted on the processor, the positioner presents the engaged sheets to processing elements which withdraw both sheets as a unit from the positioner, with one sheet being thereby withdrawn from the cassette, for conventional processing.