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Patents: 380 of 530

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Jacob Jacobs
45 of 57

SPECIFICATION forming part of Design No. 27,703, dated September 28, 1897.
Application filed May 8, 1897. Serial No. 635,752. 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 Lenses 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 is a cross-section of the same.
    Letters of like name anti 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 specified.
    The leading feature of my design consists of the lens A, provided with prisms B and B, having waved or scalloped edges b and b.
    As shown in the drawings, the lens consists
of a plate A, having one face plane and on its other face a number of parallel ribs or prisms B and B, that are triangular in cross-section, one face of each rib being perpendicular to the plate and the other inclined. The latter is a plane surface, but the perpendicular face has a waved or scalloped formation from end to end that is produced by a series of concavities b and b.
    My lens has not only a unique appearance, but it has superior light-transmitting capacity.
    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, 1897.