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UNITED STATES PATENT OFFICE.
JAMES G. BROWN, OF CLEVELAND, OHIO, ASSIGNOR OF ONE-HALF TO THE
CLEVELAND WINDOW GLASS COMPANY, OF SAME PLACE.

DESIGN FOR A PRISM-PLATE.
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James G. Brown
2 of 3

SPECIFICATION forming part of Design No. 33,562, dated November 13, 1900.
Application filed October 19, 1900. Serial No. 33,661. Term of patent 14 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 Prism-Plates, of which the following is a specification, reference being had to the accompanying drawings, forming a part thereof.
Figure I is a view in perspective of a prism-plate embodying my design. Figs. II and III are views of opposite side edges of the plate.
My said design for a prism-plate comprises two series of ribs formed upon one and the same side of the plate. All of the said ribs are parallel and extend transversely of the plate. The ribs 6 of one of the series of ribs alternate with the ribs 7 of the other series of ribs. All of the said ribs project the same distance from the body portion 5 of the plate. Each rib 6 has two curved sides or faces 8 and 8, that extend from end to end of the rib and curve outwardly and converge from the body portion. Each rib 7 has two flat and straight sides or faces 9 and 10, extending from end to end of the rib and converging from the
body portion of the plate. The face 10 of each rib 7 is arranged at greater angle to the plate's body portion than the other face 9 of the said rib and is consequently not as wide as the said face 9.
The essential feature of my design consists in the two series of parallel ribs formed upon one and the same side of the plate, with the ribs of one series alternating with the ribs of the other series, and with straight flat faces formed upon the ribs of one of the series of ribs and with curved faces formed upon the ribs of the other series of ribs.
A prism-plate having the design hereinbefore described is remarkable for its brightness and is beautiful in appearance.
What I claim is—
    The design for a prism-plate as herein shown and described.
    Signed by me at Cleveland, Ohio, this 10th day of October, 1900.
JAMES G. BROWN.
Witnesses:
    C. H. DORER,
    A. H. PARRATT.