1981-08-31
1984-07-03
Punter, William H.
350239, 350245, 350255, 350452, G02B 2702, G02B 704, G02B 308
Patent
active
044575858
ABSTRACT:
A clear, transparent, rigid plastic sheet is bent into an inverted U-shape to provide a top supported by continuous transparent legs. A fresnel lens, coextensive with the top, is secured to the top or actually formed in one of its surfaces to provide a hand-free, self-supporting large area magnifier capable of use in reading a complete printed page with little or no shifting of the magnifier. For various scientific and other purposes, scales, grids, or other reference marks or patterns are carried on transparent elements secured to the bottoms of the legs where they are likewise magnified for counting or measuring or other large area analysis, or study of a full page or document being read.
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Cooke, F., "Aid to Viewing Test Plate Interference Fringes", App. Optics, 9-1971, pp. 2216-2217.
Photocopies of photographs, FIGS. 1 through 6.
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