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D27,990: 1 of 2

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Patents: 424 of 511
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.
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Frank L. Wright
14 of 41

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Luxfer: 57 of 88

SPECIFICATION forming part of Design No. 27,990, dated December 7, 1897.
Application filed October 2, 1897. Serial No. 653,864. Term of patent 14 years.
To all whom it may concern:
    Be it known that I, FRANK L. WRIGHT, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a certain new and original Design for a Prism-Plate, of which the following is a specification.
    My invention relates to designs for prism-plates, and is illustrated in the accompanying drawings.
    Figure 1 is a plan view of a prism-plate. Fig. 2 is a section therethrough.
    A is a prism-plate having prisms on one
size and provided with the circular portion B. The plate consists of a substantially flat body.
    The essential features of my design are found in a prism-light comprising a substantially flat prism-plate with the circular part B.
    I claim--
    A design for a prism-plate substantially as shown and described.
FRANK L. WRIGHT.
Witnesses:
    DONALD M. CARTER,
    HOMER L. KRAFT.