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Patents: 203 of 530	UNITED STATES PATENT OFFICE PETER H. JACKSON, OF SAN FRANCISCO, CALIFORNIA. FLOOR, ROOF, OR AREA-COVERING.	Peter H. Jackson 9 of 14
SPECIFICATION forming part of Letters Patent No. 367,343, dated July 26, 1887. Application filed January 13, 1887. Serial No. 224,305. (No model.)

To all whom it may concern:     Be it known that I, PETER H. JACKSON, of the city and county of San Francisco, State of California, have invented an Improvement in Floors, Roofs, and Area-Coverings; and I hereby declare the following to be a full, clear, and exact description of the same.     My invention relates to certain improvements in fire-proof floors, roofs, pavements, or area-coverings; and it consists of a surface of artificial stone or concrete, either with or without glass set therein for illuminating, together with corrugated metal plates or sheets, strengthening-bars, beams, metal straps, bent plates, or gratings, in connection with said plates, together with certain details of construction, all of which will be more fully explained by reference to the accompanying drawings, in which--     Figure 1 is a perspective view showing a building-front, the risers, and my improved pavement or area-covering. Figs. 2 and 3 are vertical sections showing my improvement with and without glass. Fig. 4 is an end section of the corrugated metal plates with corrugated strips fitting inside, and also showing a strip fitted outside of the corrugations, strengthening the same and to make the lap-joint water-tight. Fig. 5 is a longitudinal section showing the corrugated plates having the ends set in angle-iron. Fig. 6 is a plan of the same. Fig. 7 is a cross-section, taken through X Y of Fig. 6, looking toward the right.     In my patent of March 31, 1885, No. 314, 677, metallic supporting-beams are shown, which extend outward from the building and are fitted to support the ends of the corrugated plate or plates that extend between the beams. These corrugations, which form the strengthening-plate, extend across between beams and parallel with the building-front, the corrugated plates supporting a filling of artificial stone or concrete, the top of which forms the pavement or surface. These corrugated plates are usually perforated to receive thick glass, which serves to light the basement or area beneath. In practice I have found that the corrugations, which extend parallel with the building-front, as before stated, and which are of considerable depth to provide the necessary strength of plate, will cut off the light from the glass, which is fitted into the plates, so that

it will not be thrown back into the basement as far as it should be on account of the depth of these ribs or corrugations.     Experience has shown that the person standing erect in an ordinary basement, twenty feet from the front, would be unable to see the glass, for the reason above described, and the rays of light would thus be cut off, so that 6o the best effect is not produced.     The object of my present invention is to so construct the roof or covering that tile light will not be cut off, and for that purpose I make the plates A with intermediate depressions or corrugations, which are extended down to a considerable depth, so as to give the greatest possible strength to the plates, which are made of heavy sheet metal, rolled or formed in the shape as shown. These plates are placed so that the corrugations or ribs extend outwardly or at right angles from the front of the building, so that the ribs will not obstruct the plain portion of the plate in which the glass is set when glazing is employed. In order to strengthen the plates still further, I place vertical ribs of iron, D, in the corrugations, extending from end to end, and when the cement is filled in about them and upon the surface of the plate the whole is united and forms a rigid and solid pavement.     In Fig. 4 I have shown at E, on the right of the figure, the corrugations made dovetailed, with the widest portion at the bottom, and over these I have shown correspondingly-shaped angular plates, which are slipped on from the ends, so as to fit over these lap-joints and inclose them. The left central portion of this figure shows similar angular plates fitted inside of the corrugations, which are in this case made shaped as those shown at E, and are continuous without forming any lap-joint at that point. These supplemental plates, fitted in this manner, serve to greatly strengthen the corrugations, and the vertical longitudinal ribs may be left out, if desired, or they may be placed in the corrugations to give additional strength to the same. When the plastic compound of which the pavement is formed is forced into these dovetailed corrugations, it too forms a strong lock and bond to hold the whole together and give it strength. In some cases these strips or bars may be secured upon the outside of the bottom of the corrugations, as