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257,822 · Hyatt · "Illuminating Grating and Buildings Lighted Thereby" · Page 1
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UNITED STATES PATENT OFFICE
THADDEUS HYATT, OF NEW YORK, N. Y., ASSIGNOR TO
ELIZABETH A. L. HYATT, OF SAME PLACE.

ILLUMINATING-GRATING AND BUILDING LIGHTED THEREBY.
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Thaddeus Hyatt
48 of 67

SPECIFICATION forming part of Letters Patent No. 257,822, dated May 9, 1882.
Application filed April 19, 1882. (No model.)
To all whom it may concern:
    Be it known that I, THADDEUS HYATT, a citizen of the United States, and resident of the city, county, and State of New York, have invented certain new and useful Improvements in Illuminating-Gratings and Buildings Lighted thereby, of which the following is a specification.
    In the drawings attached hereto and making a part of this specification like letters refer to like parts in all the figures.
    Figure 1 represents a prism-glass as ordinarily made for vessels' decks. A is the glass; a, the top surface; b, one slope of the prism; b', the other slope; B, the end or perpendicular side of the prism.
    Fig. 2 represents a cluster-lens prism-glass. c c are the lenses.
    Fig. 3 represents a metallic grating set with cluster-lens prism glasses. C is the metallic grating; l s, long sides of the grating.
    Fig. 4 represents a cluster-lens prism-glass with enlarged reflecting prism-surfaces. b" b" are the enlarged surfaces.
    Fig. 5 represents a cluster-lens enlarged reflecting-surface prism-glass made with but one reflecting-slope. b4 is the reflecting-slope; d, perpendicular or non-reflecting face of the prism.
    Fig. 6 represents a single-lens prism-glass.
    Fig. 7 represents a single-lens prism-glass with enlarged reflecting prism-surfaces.
    Fig. 8 represents a basement and basement-extension lighted by an illuminating area-covering formed of metallic gratings set with cluster-lens prism-glasses made with enlarged reflecting prism-surfaces. D is the basement; E, basement-extension; F, illuminating stoop or area covering; f s, front or street face of the building.
     Fig. 9 represents the rear wall of a building above the ground-floor or principal story, the rear wall of the extension, and the opening between the two walls for admitting light into the room. G is the rear wall above the room; H, the rear wall of the extension; I, the light-opening between the walls; J, the room lighted.
    Fig. 10 represents a ground-floor or principal story lighted by a
curved illuminating-grating roof set with prism-glasses. K is the curved roof.
    Fig. 11 represents a ground-floor or principal story lighted by a ventilating step-roof formed of metallic gratings set with lens prism-glasses. L is the step-roof; v', ventilating-flaps set with glass.
    The object of my invention is to reflect day-light into the basement and principal story of a building without the necessity of employing "daylight-reflectors."
    My improvements are based upon a form of glass represented by Fig. 1, where the whole of the reflecting-power of the prism is confined to two sloping flat reflecting-faces, indicated by the letters b and b', the ends B of the glass being perpendicular, and consequently non-reflecting.
    The glass upon which my improvements are based is known to ship-builders as the "prism deck-light." My improvements upon this glass to adapt it to the purposes of lighting buildings are as follows, viz: first, forming the weather-face of the glass with a cluster of lenses, represented by c c, Fig. 2, the effect of the lenses being to enlarge the light-receiving surface of the glass; second, in combination with the lens enlarged receiving-surface, an enlarged distributing-surface, as represented by b''' and b4 in Figs. 4, 5, and 7, to compensate for the increased volume of received light due to the lenses; and, third, a lens prism-glass formed with but one reflecting-slope, as represented by Fig. 5, where d is a perpendicular non-reflecting face similar to the ends B. These glasses I call "combination lens and prism-glasses."
    My improvement in combining lens prism-glasses with metallic gratings as an illuminating building material consists in setting the lens prism-glasses in the grating with the reflecting-slopes of the prisms in line with the long sides of the grating, as represented in Fig. 3; and my improvements in the method of illuminating buildings consist in constructing the illuminating rear extension-roofs and front area-coverings thereof with illuminating-gratings made in manner as represented by Fig. 3, and combining the same with the buildings