USD28008S - Frank l - Google Patents

Description

DESIGN.

F. L. WRIGHT.

PRISM PLATE.

Patented Dec. 7, 1897.

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UNITED STATES PATENT OFFICE.

FRANK L. \VRIGHT, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE LUXFER PRISM PATENTS COMPANY, OF SAME PLACE.

DESIGN FOR A PRISM-PLATE.

SPECIFICATION forming part of Design No. 28,008,11ated December 7, 1897.

Application filed October 23, 1897. Serial No. 656,233. Term of patent 14 years.

To all whom it may concern.-

Be it known that I, FRANK L. \VRIGHT, a citizen of the United States, residing at Ohieago, in the county of Cook and State of Illinois,have invented a certain new and original Design for Prism-Plates, of which the following is a description.

My invention relates to designs for prismplates.

Figure 1 is a plan view of a prism plate embodying my design. Fig. S2 is a section.

A is the body of the prism-plate; B I a series of lines of separation on the face thereof, which divide the face surface into a series of minor and substantially uniform surface areas 0 C. D D are prisms on the back of said prism-plate, set at a certain angle, and E E other prisms set at a different angle. These latter prisms are scattered about among the first mentioned, so that the first-mentioned prisms form a sort of field and the latter a set of prism areas in such field of a different angle. \Vhen viewed from the prism side,it has the appearance of a field of prisms of a certain angle with scattered prism areas of a different angle. \Vhen viewed from the plain side, the appearance of the prism-surfaces of different angular arrangement is such as to present a field of a given appearance with a series of surface areas scattered through the same having a different appearance.

The essential features of my design are found in a pris1n-plate substantially flat and extended, divided on one side into a series of surface areas by lines of separation and provided on the other side with a prism surface or field formed of prisms of a certain angle with a number of prism-surfaces scattered about through the field formed of prisms of a different angle.

I claim- A design for a pris1n-plate,substantiallyas shown and described.

FRANK L. \VRIGIIT.

\Vitnesses:

OLIN II. Inseam, O. A. LONGFELLOW.

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