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James G. Brown
1 of 3

SPECIFICATION forming part of Design No. 31,811, dated November 7, 1899.
Application filed April 3, 1899. Serial No. 711,601. Term of patent 7 years.
To all whom it may concern:
    Be it known that I, JAMES G. BROWN, a citizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented and produced a new and original Design for a Prism-Plate, of which the following is a specification, reference being had to the accompanying drawings, forming a part thereof.
    In the drawings, Figure I is an elevation of the inner side of the plate. Fig. II is a side edge view of the same. Fig. III is a central horizontal section of the plate. Fig. IV is a central vertical section of the same.
    The design comprises parallel horizontally-arranged ribs a, formed upon the inner side of the plate between the upper and lower edges of the plate; and an essential and characteristic feature of the design consists in a cone formed upon and centrally of the said side of the plate and arranged in the vertical or upright plane that contains the ribs.
The cone and the ribs project laterally, therefore, of the same side of the plate. The ribs of the plate above and below the cone extend across the plate. The ribs at each side of the cone terminate at or near the base of the cone, so as to form an annular concavity around the cone.
    A cone formed centrally of a prism-plate and in the same plane that contains the ribs of the plate and the annular concavity around the cone vastly improve the appearance of the plate.
    What I claim is—
    The design for a prism-plate, substantially as shown and described.
    Signed by me at Cleveland, Ohio, this 7th day of March, 1899.
    C. H. DORER,
    A. H. PARRATT.