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458,850 · Jacobs · "Illuminating-Tile" · Page 2
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in directly transmitting and in reflecting it, diffuses or distributes it over a wide area.
    I am aware that it has been proposed to form plates of glass with triangular or prism-like projections on one face but such projections were to have both their faces plane. Such an arrangement differs essentially from mine, in that with both faces plane surfaces there can be a direct transmission of the oblique rays only, the perpendicular rays being reflected.
    If desired, the surface a of the plate A may be other than plane and the shape of said plate other than rectangular. So, too, the projections need not be straight ribs and their angular shape may be varied.
    Having thus described my invention, what I claim is--
    1. As an improvement in illuminating-tiles, a lens consisting of a glass body having on one of its faces a rib that stands away from such body and on which are small projections or protuberances, substantially as and for the purpose specified.
    2. As an improvement in illuminating-tiles, a lens consisting of a glass body having a series of triangular projections, on each of which are formed a number of small angular projections or protuberances, substantially as and for the purpose shown.
    3. As an improvement in illuminating-tiles,
a lens consisting of a glass body having a series of parallel projections or ribs, each triangular in cross-section and having a series of parallel triangular ribs on one face, the other face being a plane, the ribbed face of one triangular projection being opposed to the plane face of the adjacent projection of the series, substantially as and for the purpose specified.
    4. As an improvement in illuminating-tiles, a lens having a plane face and a face formed by a series of parallel projections on which is a series of smaller projections or protuberances, substantially as and for the purpose set forth.
    5. As an improvement in illuminating-tiles, a lens consisting of a plate of glass having a plane surface and a surface formed by a series of triangular projections or ribs on which is a series of smaller triangular ribs, each of the latter having a face parallel with the plane surface of the glass and a face at a right angle thereto, substantially as and for the purpose shown.
    In testimony that I claim the foregoing I have hereunto set my hand this 13th day of April, 1891.
JACOB JACOBS.
Witnesses:
    GEO. W. TICE,
    D. G. BEECHING.