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458,854 · Mark · "Glass for Light-Transmitting and Ventilating" · Page 2 Home  > Prism Glass  > Patent Index  > Page 2

458,854: 2 of 3

one and each containing a cavity, substantially as and for the purpose described.     5. A glass for illuminating and ventilating purposes, consisting of a plate having an aperture formed by two convexo-concave offsets disposed one on the outer and one on the inner side of said plate, the outer one being in the higher plane, substantially as and for the purpose set forth.     6. A glass for illuminating and ventilating purposes, consisting of a plate having an aperture formed by two convexo-concave offsets disposed the one on the outer and one on the inner side of said plate, the lower edge of the outer offset standing away from the surface of the plate and the upper edge of the inner offset likewise standing away therefrom and the said edges being in the same horizontal

plane, substantially as and for the purpose shown and described.     7. A glass for illuminating and ventilating purposes for use in vertical situations, consisting of a rectangular plate having a number of apertures formed each by two reversely-arranged convexo-concave offsets disposed the one on the outer and one on the inner side of said plate, the former being in the higher plane, substantially as and for the purpose specified.     In testimony that I claim the foregoing I have hereunto set my hand this 16th day of April, 1891. JOHN W. MARK. Witnesses:     GEORGE SCHUCHMAN,     CHAS. HINMETSBACH.