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Patents: 371 of 530	UNITED STATES PATENT OFFICE. JOHN W. MARK, OF NEW YORK, N. Y. DESIGN FOR A LENS FOR TILES.	John W. Mark 7 of 8
SPECIFICATION forming part of Design No. 27,502, dated August 10, 1897. Application filed June 23, 1897. Serial No. 641,993. Term of patent 14 years.

To all whom it may concern:     Be it known that I, JOHN W. MARK, of New York city, in the county of New York, and in the State of New York, have invented a certain new and original Design for Glass for Illuminating-Tiles; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, in which—     Figure 1 is a perspective view of a glass embodying my design, and Fig. 2 a top plan view thereof.     Letters of like name and kind refer to like parts in each of the figures.     The object of my invention is to provide a new and ornamental shape for the glasses of illuminating-tiles; and to this end said invention consists in the design for a glass having as its leading feature its sides formed by convexly-rounded surfaces alternating with concavely-rounded surfaces, substantially as herein set forth.     The general shape of the glass shown in the drawings is square. At each of its corners the class is rounded convexly, the convexity A at one surface of the glass being carried into the body thereof, and each side of the glass is curved concavely, the concavities B and B thus formed being deepest at the surface of the glass where the convexities A and A cut into the body of the glass and, gradually

decreasing toward the opposite surface of the body, disappear at the edge of such opposite surface. Between the side of each convexity A and each concavity B there is an angular depression or cavity C, that, being deepest at the surface of the body where the concavities B and B are deepest, gradually diminishes in depth toward and disappears before reaching the opposite surface.     It will be seen that the outline of one surface of the glass is formed of the alternately-arranged convex and concave curves, while the opposite surface has an outline forming a square with its corners rounded.     Besides presenting an ornamental appearance my glass has superior light-transmitting capacity and is well shaped to afford ample space to accommodate the cement employed to secure it in place for use.     Having thus described my invention, what I claim is—     The design for a glass or lens, substantially as set forth.     In testimony that I claim the foregoing I have hereunto set my hand this 22d day of June, 1897. JOHN W. MARK. Witnesses:     CHAS. W. MARK,     CHRIST. H. MÜLLER.