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Patents: 474 of 502	UNITED STATES PATENT OFFICE WILLIAM B. JACOBS, NEW YORK, N. Y. DESIGN FOR A GLASS OR LIGHT.	W. B Jacobs 2 of 3
SPECIFICATION forming part of Design No. 30,001, dated January 10, 1899. Application filed December 17, 1898. Serial No. 699,606. Term of patent 14 years.

To all whom it may concern:     Be it known that I, WILLIAM B. JACOBS, of the borough of Brooklyn, New York city, in the State of New York, have invented and produced a certain new and original Design for a Glass or Light; 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 or light embodying my design, and Fig. 2 a cross-section of the same.     Letters of like name and kind refer to like parts in each of the figures.     The object of my invention is to provide a design for a glass or light for illuminating gratings; and to this end said invention consists in the design for a glass or light, substantially as hereinafter set forth.     The leading feature of my design consists of parallel ribs on the glass or light, each of which has a triangular form in cross-section,

the sides of the triangle being respectively convex and concave, which ribs alternate with other ribs that are smaller and are triangular in cross-section.     The glass is in the form of a rectangular plate A, having a series of parallel ribs B and B, that are triangular in cross-section, the sides of each rib being respectively convex and concave. Alternating with the ribs B and B are smaller angular or prismatic ribs C and C.     Having thus described my invention, what I claim is—     The design for a glass or light, substantially as shown and described.     In testimony that I claim the foregoing I have hereunto set my hand this 30th day of September, 1898. WILLIAM B. JACOBS. Witnesses:     CHARLES C. REILLY,     JOHN L. COLLINS.