A viewer has a telescopic housing and includes a lens system carried by one housing part and a plurality of correlated information sources supported by another housing part and arranged serially along the optical axis of the lens system in a plurality of focal planes. At least one of the information sources comprises a transparency which has data thereon and is disposed between the lens system and another of the information sources. When the lens system is focused on the one information source the other of the information sources are out of the field of focus of the system whereby data on any one of the information sources may be viewed to the selective exclusion of data on the other of the information sources. Color filters associated with the lens system may be employed to view portions of data on any one information source to the exclusion of other data thereon.
A hand-held navigational tool including one or more maps, preferably in the form of photograhic transparencies, releasably mounted upon a base for viewing through an opening in the base and rotatable about the center of the opening relative to course bearing indicia carried on a transparent graticule which is superposed with the viewed portion of the map. The viewer is carried on a member movably linearly in any direction in a plane parallel to that of the map to allow magnified viewing of a portion of the map while permitting visual excursion over the entire map. A compass, relative distance scales, map illumination means and selectively operable means for scribing a course line in the map holder or rotating the viewed portion of the map about a fixed point are all additional features which may be incorporated in the unit.
A portable, compact, battery-operated light apparatus for use with a compact computer game having a LCD video screen for enhancing the visibility of the LCD screen in use, which light apparatus comprises a body with a battery compartment and having side panels which define an open viewing space and lights provided in the body element to provide for indirect lighting of the viewing space, the light apparatus comprising a portable, compact, battery-powered light apparatus and which includes ridges on the light apparatus which snap in a releasable manner onto the grooves in a compact computer game video system to releasably secure the light apparatus in position over the LCD video screen of the compact game system.
A compact, portable combined light and magnifier apparatus and method for use with portable computer, such as a portable, hand-held video game, having a video screen, such apparatus comprises a body composed of a plurality of panels which define an open space generally the size of the video screen and a battery compartment to supply power and lighting means within the body to provide indirect lighting to the video screen, the body and the battery compartment containing ridges which provide for the body to be releasably secured to the computer with the video screen. The apparatus includes a cover to fit over the open viewing space of the body and pivotable between a closed, compact position adjacent the face side of the body and an open, use position extending generally perpendicularly outwardly from the face side of the body. The magnifier portion comprises a frame and a magnifying lens secured within the frame, the lens adapted to conform generally with the computer video screen, the frame pivotably secured within the cover and adapted to move between a compact, stored position within the cover and a magnifying, use position extending generally perpendicularly from the face of the body to place the magnifying lens a defined, fixed distance directly over the video screen.
