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257,822 · Hyatt · "Illuminating Grating and Buildings Lighted Thereby" · Page 2
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by laying the long-sides of the illuminating-gratings parallel to the face or front wall of the building when for an area-covering, as represented in Fig. 8, and parallel to the rear wall of the building when for a rear-extension roof, as represented in Fig. 11, this method of combining the prism-glasses with the gratings, in combination with the method of combining such gratings with the buildings, causing the reflecting-slopes of all the glasses to act as daylight-reflectors for the purpose of throwing light into the building in the directions required.
    H, Fig. 9, represents the rear wall of a ground-floor or principal story of a building, and G represents the rear wall of the building above the ground-floor. The wall H is represented as would be required in the making of flat roofs; but in practice this form of roof is avoided in rear extensions, because of the loss of angular light such a mode of construction would entail, as is made evident, by the mass of rays cut off by the portion of the wall H between N and M. Illuminating rear-extension roofs are therefore, as a general thing, constructed on the principle of a "lean-to," but made in curved form, as represented by Fig. 10; but the form of the prism-glass is not adapted to roofs of the lean-to type, especially curved roofs. This point I have illustrated by representing the curved roof as set with prism-glasses, the effect of which, where the light-rays fall upon the glasses in the lower portion of the roof is to reflect the light out of doors, as represented in the figure, where the ray r is reflected back on the line s and the ray t is reflected back on the line u. The form of the prism-glass requires that the plane of the roof where such glasses are employed should be practically horizontal; but the conditions connected with rear-extension roofs require them to be in effect lean-to constructions, and a lean-to cannot be a horizontal roof.
    My invention to adapt the use of prism-glasses to the construction of illuminating rear-extension roofs consists in making the roof in the step form, as represented in Fig. 11, where m m represent the "illuminating-treads" and v v the "risers," one or more or all of them being arranged to open, as represented by v'. The treads are all slightly inclined, as shown, in order that the light-rays reflected from the prism of one glass may not be interfered with by the projection of a glass in front of it. The effect of this inclination of the treads I have illustrated by the light-rays n o p q, each passing clear of the glass in front of it.
    The mode hereinabove described of constructing illuminating step-roofs for the rear
extensions of the ground-floors of buildings applies equally, with proper modifications, to the construction of illuminating step-roofs for the front entrances to buildings.
    What I claim as my invention, and desire to secure by Letters Patent, is--
    1. Illuminated basements, illuminated basement-extensions, and illuminated ground-floors of buildings lighted by metallic gratings set with prism-glasses, when the same are formed with either single or cluster lenses upon the weather-face thereof, the glasses being so set in the gratings and the gratings so combined with the parts of the building to be lighted as that the reflecting-slopes of the prisms shall lie parallel with the front and rear walls of the building, substantially as and for the purposes herein set forth and illustrated.
    2. Combination lens and prism-glasses, where the portion of the glass is formed of two non reflecting or perpendicular ends and two sloping opposing sides, the internal faces of which receive and distribute the light of the lenses, and combining the same with metallic gratings, substantially as and for the purposes herein set forth and illustrated.
    3. Combination lens and prism-glasses, where the prism portion of the glass is formed of two non-reflecting or perpendicular ends and two sides, one of which is perpendicular, or nearly so, and the other a slope, the internal face of which receives and distributes the light of the lenses, and combining the same with metallic gratings, substantially as and for the purposes herein set forth and illustrated.
    4. Combination lens and prism-glasses, where the area of the internal reflecting face or faces of the prism is enlarged, and combining the same with metallic gratings, substantially as and for the purposes herein set forth and illustrated.
    5. An illuminating rear-extension roof constructed in the form of steps, made of illuminating treads and risers, substantially as and for the purposes herein set forth and illustrated.
    6. illuminating-steps and step-roofs formed of metallic gratings set with combination lens and prism-glasses, substantially as and for the purposes herein set forth and illustrated.
    7. Illuminating area-coverings formed of metallic gratings set with combination lens and prism-glasses, substantially as and for the purposes herein set forth and illustrated.
    In testimony whereof I hereto affix my signature in presence of two witnesses.
THADDEUS HYATT.
Witnesses:
    T. C. BRECHT,
    LLOYD F. KELEHER.