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D27,490: 1 of 2

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Patents: 367 of 511 		UNITED STATES PATENT OFFICE.
JACOB JACOBS, OF BROOKLYN, NEW YORK.

DESIGN FOR A LENS FOR GRATINGS. 		First: 154,048 · Hyatt & Jacobs · "Improvement in Illuminating Roofing-Plates" · Page 1 Last: 630,706 · Jacobs · "Illuminating-Tile" · Drawing Prev: D23,083 · Jacobs · "Design for a Lens for Vault-Lights" · Page 1 Next: D27,491 · Jacobs · "Design for a Lens for Gratings" · Page 1 Navigation
Jacob Jacobs
41 of 57
SPECIFICATION forming part of Design No. 27,490, dated August 3, 1897.
Application filed May 8, 1897. Serial No. 635,749. Term of patent 14 years.
To all whom it may concern:
    Be it known that I, JACOB JACOBS, of Brooklyn, in the county of Kings and in the State of New York, have invented a certain new and original Design for Lens for Illuminating-Gratings; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, in which—
    Figure 1 is a perspective view of a lens embodying my design, and Fig. 2 a cross-section of the same.
    Letters of like name and kind refer to like parts in each of the figures.
    The object of my invention is to provide a design for lenses for illuminating-gratings; and to this end said invention consists in the design for a lens, substantially as hereinafter set forth.
    The leading feature of my design is a plate with one surface plane and its opposite surface provided with two parallel ribs that are triangular in cross-section, the opposite sides 		of each rib being inclined relative to the plane of the plate and the apex of one rib being a less distance from the plate than the apex of the other.
    The lens consists of a plate A with one face plane and two straight parallel ribs or projections B and C on its opposite face, each of said ribs being triangular in cross section with both sides of each inclined with relation to the plate A, and the apex of the rib B being a less distance from the plate than the apex of the other.
    Having thus described my invention, what I claim is—
    The design for a lens, substantially as set forth.
    In testimony that I claim the foregoing I have hereunto set my hand this 7th day of May, 1597.
JACOB JACOBS.
Witnesses:
    JAS. E. HUTCHINSON,
    CHAS. J. WILLIAMSON.