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Patents: 370 of 530	UNITED STATES PATENT OFFICE. JACOB JACOBS, OF BROOKLYN, NEW YORK. DESIGN FOR A LENS FOR GRATINGS.	Jacob Jacobs 44 of 57
SPECIFICATION forming part of Design No. 27,493, dated August 3, 1897. Application filed May 8, 1897. Serial No. 635,753. Term of patent 14 years.

To all whom it may concern:     Be it known that I, JACOB JACOBS, of Brooklyn, in the county of Kings, and in the State of New York, have invented a certain new and original Design for a Lens for Illuminating-Gratings; 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 lens embodying my design. Fig. 2 is a section of the same on the line x x of Fig. 1, and Fig. 3 a section on the line y y of Fig. 1.     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 lenses for illuminating-gratings; and to this end said invention consists in the design for a lens, substantially as hereinafter set forth.     As shown in the drawings, the leading or material feature of my design consists in the

formation on the lens A of numerous projections B and B, each of which has four sides, two of which converge and have the form of quadrangles and the other two have the form of triangles. The projections B and B range in parallel lines, the triangular sides of the projections of adjacent lines being inclined, so that they diverge, the appearance presented being that of V-shaped spaces between the lines of projections.     Having thus described my invention, what I claim is—     The design for a lens, substantially as set forth.     In testimony that I claim the foregoing I have hereunto set my hand this 7th day of May, 1897. JACOB JACOBS. Witnesses:     JAS. E. HUTCHINSON,     CHAS. J. WILLIAMSON.