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D27,971 · Belcher · "Design for a Prism-Light" · Page 1
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D27,971: 1 of 2

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Patents: 405 of 511
UNITED STATES PATENT OFFICE.
HENRY F. BELCHER, OF CHICAGO, ILLINOIS, ASSIGNOR TO
THE LUXFER PRISM PATENTS COMPANY, OF SAME PLACE.

DESIGN FOR A PRISM-LIGHT.
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Henry F. Belcher
18 of 20

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Luxfer: 38 of 88

SPECIFICATION forming part of Design No. 27,971, dated December 7, 1897.
Application filed November 1, 1897. Serial No. 657,105. Term of patent 14 years.
To all whom it may concern:
    Be it known that I, HENRY F. BELCHER, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented and produced a certain new and original Design for Prism-Lights, of which the following is a specification.
    My invention relates to designs for prism-lights.
    Figure 1 is a plan view of a prism-light embodying my design. Fig. 2 is a cross-section therethrough.
    A is the body of the prism-light; B, a design thereon flush with the surface; C, a series of prisms.
    When a prism-light of my design is examined, there is a continually changing effect of the design due to the presence of the prisms as a field as the point of view is changed.
With reference particularly to such lines in the design as lie diagonally to the prisms, there is great variation in appearance as the position of the observer is changed.
    The essential features of my design are found in a prism-light comprising a substantially flat relatively thin body having a series of prisms on one side and a design on the other side thereof flush with the surface, said design having lines which lie diagonally across the prisms.
    I claim--
    The design for a prism-light, substantially as shown and described.
HENRY F. BELCHER.
Witnesses:
    HOMER. L. KRAFT,
    BERTHA C. SIMS.