USD28001S - Design for a prism-plate - Google Patents

Description

DESIGN.

F. L. WRIGHT.

PRISM PLATE.

No. 28,001. Patented Dec. 7,1897.

UNITED STATES PATENT OFFICE.

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

DESIGN FOR A PRISM-PLATE.

SPECIFICATION forming part of Design No. 28,001, dated December 7, 1897.

Application filed October 21, 1897- Serial No. 655,979. 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 Chicage, 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. 2 is a section therethrough.

A is the body of a prism-plate; B B, a series of lines of separation on one side thereof whereby the surface on such side is divided into a series of surface areas 0 C of substantially uniform size.

D D are prisms of a certain angle, as indicated, and forming the field of the prisn1- plate.

E E are a series of prisms of a different angle and arranged so as to form a central field. \Vhen considered from the prism side, the outer field and the central field will differ in appearance, so as to be distinguishable one from the other.

The essential features of my invention are found in a pris1n-plate comprising a substantially flat extended body with prisms on one side, the prisms having different angles, those of one angle forming a central field and those of another angle forming an outer field.

I clai1n-- A design for a prism-plate, substantially as shown and described.

FRANK L. \V RIGHT.

Witnesses:

C. A. LoncEELLow, OLIN II. BASQUIN.

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