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Up: Patent Index 		206,332 · Hyatt · "Improvement in the Application of Cements, Clays, Metals and Glass in forming Illuminated or Other Gratings, Vault-Covers, Roofs, &c."· Page 2
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part of my invention. b b represent a belt of exposed hydraulic cement just below the glass. It forms a part of the packing around the glass, between it and the blade d d of the grating, and rests upon the top of c c, which is the bottom flange of the blade d. This belt of cement, b, acts as an absorbent to drink up any condensed moisture formed upon the under face of the glass A, the under face, e e, of the glass being curved to compel the moisture to pass down to the absorbent b. These means and combinations to effect this purpose form also a part of my invention.
    Fig. 4 represents an improved grating of the old construction, for the purpose of giving rigidity to the plate, the improvement consisting in the rim B'', formed around the edges of the grating, upon its under face, to increase the general stiffness of the plate, and at the same time produce a vertical seam or packing-joint of sufficient depth to contain the hydraulic cement, the same both fastening the grating to its seat without the use of bolts and producing a water-tight joint. This improvement also constitutes a part of my invention. C C represent a portion of the frame usually employed to connect the grating-panels into extended surfaces, as area-coverings and otherwise. f f' represent the improved vertical seam-- f' a seam without packing, and f a seam filled with hydraulic cement.
    By my new method of beam-construction gratings the bearing edges are sufficiently deep to produce the results hereinabove set forth.
    Sectional illuminating-gratings.-- The patent-light business of the country has been always hampered for want of some reliable and certain mode of constructing the gratings in stock sizes. For want of this orders can never be executed until after measurements of the openings to be covered have been taken, and "patent lights" as yet have failed to become merchandise in the markets of the world.
    Illuminating-grating surfaces, as at present made, are obtained by means of a foundation-frame made with panel-openings filled with gratings, one grating to each panel-space, the width of the frame corresponding to the width of the area covered by it, the length of the panel-spaces consequently being equal or nearly equal to the width of the area, and, as observed, one grating-panel to each panel-space. My improvement deals with these grating-panels, for, instead of making a grating as large as the panel-space, I make a series of sectional panel-gratings to fill each space, the sections, when put together, having the appearance of a single casting of large size; and in order to meet the requirements of all sorts of sizes of areas to be covered and other openings, I establish a set of standard sizes of the sectional gratings as to lengths and widths, by the combination of which panels-spaces of every dimension may be filled from stock sizes, the manufacture of these sectional gratings in stock sizes constituting a part of my invention. 		    Figs. 5, 6, and 7 represent, in plan and cross-section, (Fig. 6 being a section at x x, and Fig. 7 at y y,) a sectional grating two feet in length and one foot in width, one and a half inch thick, the diameter of the light-holes, as a rule, equaling their depth.
    Figs. 8 and 8' represent three sectional gratings as to the mode of joining them, the lip or ledge g g upon the side of one section under-lapping the edge of the abutting grating, the vertical seam h h between the two being then secured by hydraulic cement grouting.
    The foundation-frame above mentioned is costly to make and to handle, being very heavy.
    Fig. 9 represents my improved sectional frame or foundation. F F are front and rear pieces or risers, cast with sockets or shoes G. E E are the bearing-bars to make panel-spaces. Each bar is cast with an enlarged or wedge-shaped head, i i, to drop into the shoes or sockets G, and are there made fast by hydraulic cement. This method of constructing illuminating walking and weather surfaces is equally applicable to non-illuminating surfaces, such surfaces being easily made by merely substituting opaque blocks for the glass blocks. By the use of blocks of baked clay, or those made of hydraulic cement or equivalent weather-proof and durable material, colored, glazed, or otherwise, I produce weather and walking surfaces substantially as above described, except as to light.
    Roof and weather surfaces.-- The weather-surface of roofs, as ordinarily made, is a mere veneer of light material overlying a roof-framing underneath it. By my improved method of construction the frame of the entire roof is made in the form of a grating, by combining sectional gratings, as hereinabove described, and in the manner described, with the roof-rafters, and then blocking the apertures of the grating, in manner as aforesaid.
    Fig. 10 represents a roof thus constructed; B B, the spider-web gratings, abutting with each other, and forming one of the ranges or panels between the rafters D D. A portion of the gratings are represented open, as at B B, and a portion closed, as at B' B'. A part of my invention consists in covering these gratings with a construction made to produce the effect of ornamental roofing-tiles, the invention consisting in making ornamental baked-clay or other tiles, to overlie the surface of gratings, and at the same time to be firmly interlocked within the meshes of the grating. This purpose I accomplish by forming the tiles upon the back or under face with blocks to fit the openings in the gratings, as represented by Fig. 11, 11¹, 11², B''' being the face of the tile, and A A the blocks upon the under or grating face. These tiles may be molded from hydraulic cement, especially the Sorel, or made of Portland, and faced with the Sorel in plain or fancy colors, and with bas-relief figures upon them, as shown, or made with a weather-face to resemble overlapping tiles, or otherwise formed.