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Patents: 334 of 530	UNITED STATES PATENT OFFICE JOHN M. EWEN, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE LUXFER PRISM PATENTS COMPANY, OF SAME PLACE. DESIGN FOR A PRISM-PLATE.	John M. Ewen 11 of 21 Luxfer: 27 of 88
SPECIFICATION forming part of Design No. 27,347, dated July 13, 1897. Application filed June 15, 1897. Serial No. 640,939. Term of patent 14 years.

To all whom it may concern:     Be it known that I, JOHN M. EWEN, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented and produced a new and original Ornamental Design for Prism-Plates, of which the following is a specification.     My invention relates to a design for prism-plates, and is illustrated in the accompanying drawing, showing a prism-plate containing my design.     A is the central body, substantially circular in cross-section, or at least bounded by curved lines. B B are prisms thereon.     C is one of the triangular corner-pieces, the side opposed to the central part being curved to correspond with the curvature of the central part.

D D are the prisms on such corner-pieces.     The five parts constitute substantially a square or rectangular piece.     The essential features of my design are found in a prism-light consisting of a central prism-covered surface bounded by curved lines and four prism-covered surfaces bounded each by an inner curved line and by outer right lines, substantially as shown.     I claim--     The design for a prism-plate substantially as shown and described. JOHN M. EWEN. Witnesses:     DONALD M. CARTER,     HOMER L. KRAFT