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D27,345 · Ewen · "Design for a Prism-Plate" · Page 1
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Patents: 332 of 511
UNITED STATES PATENT OFFICE
JOHN M. EWEN, OF CHICAGO, ILLINOIS, ASSIGNOR TO
THE LUXFER PRISM PATENTS COMPANY, OF SAME PLACE.

DESIGN FOR A PRISM-LIGHT.
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John M. Ewen
9 of 21

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Luxfer: 25 of 88

SPECIFICATION forming part of Design No. 27,345, dated July 13, 1897.
Application filed June 15, 1897. Serial No. 640,933. Term of patent 14 years.
To all whom it may concern:
    Be it known that I, JOHN M. EWEN, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented and produced a new and original Ornamental Design for Prism-Plates, of which the following is a specification.
    My invention relates to a new design for prism-plates.
    It is illustrated in the accompanying drawing, wherein is shown a prism-plate consisting of a series of diamond-shaped prism-lights A A and sections of diamond-shaped prism-lights B B and C C. Each of these prism-lights is provided with a prism-surface consisting of the prisms D. E E are opaque frame-pieces which run diagonally between the diamond-shaped lights.
    I have shown certain angles for the diamonds and for the prisms and certain numbers of prism-lights; but the essential features of my design are found in a plate composed of a series of substantially diamond-shaped prism-lights and portions of diamond-shaped prism-lights set together so as to form a plate and all having prisms thereon substantially parallel to the shorter axes of the prism-lights.
    I claim--
    The design for a prism-plate substantially as shown and described.
JOHN M. EWEN.
Witnesses:
    DONALD M. CARTER,
    HOMER L. KRAFT