Abstract: An apparatus for three-dimensional display of a two-dimensional image such as that produced on a television screen or a photograph. The apparatus is an array of lens assemblies that are placed adjacent to the plane of the two-dimensional image. The lens assemblies comprise, in the preferred embodiment, an object lens, an image lens, and a semi-rigid transparent layer between the lenses. The apparatus can be modified to provide three-dimensional viewing of a projected image such as that produced by a slide projector by adding a secularly mirrored surface to the object lens.

Abstract: An X-ray tube having internal shielding and producing less external stray radiation comprising an evacuated envelope, an X-ray generating target within the envelope, an electron gun positioned within the envelope to direct a stream of electrons at the target, a window arranged to direct the resulting X-rays through the envelope, high density attenuating means located within the envelope and substantially surrounding the target to attenuate high energy photons which do not exit through the window means, and a lower density metal covering about at least a portion of the high density attenuating means in order to reduce the intensity of secondary X-ray emission from the high density attenuating means.