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272,383 · Hyatt · "Illuminating Vault-Cover or Grating-Tile and Surfaces Made of the Same" · Page 2
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the mount may be pure brimstone, if desired. Fig. 17 represents a brimstone mount around a glass.
    Like letters refer to like parts in all the figures.
    A represents the foundation-frame, B represents the cross-bars of the frame; B', the X form or duplex character of the bar. C represents illuminating covers or grating-tiles. D represents the glasses of the vault-covers or grating-tiles; a a, border of foundation-frame; b b, lugs on or solid metal between flutes in the sides of rafters or cross-bars of foundation-frame; c c, flutes in cross-bars of foundation-frame; d d, recessed or cellular face of vault-cover or grating-tile; a a, body of vault-cover or grating-tile between light-holes; f f, iron knobs between glasses of cast-iron grating-tiles; g g, under side of vault-cover or grating-tile; g' g', junction edges of the under side of grating-tile; h h, channel or seam over junction edges, made water-tight by a filling of coal-tar-sulphur cement; i, screw fastening two tiles to cross-bar; j j, inelastic rings around upper section of glasses before putting on of concrete; j' j', inelastic rings around glasses while concrete sets and hardens; k k, annular space left around glasses by removal of rings; l l, brimstone rings around glasses closing annular spaces; m n, rabbeted seats in grating-tiles; m, bottom of seats; n, sides of seats; p p, coal-tar-sulphur cement; q q, covered joint knobs or rings; r r, cast-iron rings.
    Figs. 1 to 6 represent my improvements in the construction of illuminating-surfaces of the kind ordinarily made by the makers of patent lights to cover sunk areas at the front of buildings. The tiles shown are of the knob-light kind, (the ones mostly made and sold.) Fig. 1 represents a surface formed of three tiles, C C C, the length of each tile being equal to the width of the foundation-frame between the ornamental border of the same, and the width of each tile being equal to one-third the length of the foundation-frame between the border of the same, this shape of the tiles corresponding with the shape of the spaces between the cross-bars of the frame. As ordinarily made, three distinct panels would be seen, whereas in Fig. 1 the appearance is that of a single tile. This improvement is effected by forming the tiles without dead material at the junction edges-- a feature claimed herein only in combination, inasmuch as my Patent No. 257,712, dated May 9, 1882, contains the broad claim to such tiles. The absolutely new features in the construction illustrated by Figs. 1 to 6 are to be seen in Figs. 2, 3, 4, 5, 6, where B represents a cross-bar of a foundation-frame, 4 5 6 illustrating the improvement in the bar, which consists in cutting lightways c c or flutes in the sides of the bar to permit the passage of all the light-rays that enter the rows of glasses at the junction edges, where they overlap the supporting-bar B, as seen in Fig. 3. The solid metal b b between the flutes may be extended in the form of lugs to any desired
extent underneath the tiles, on either side of the bar B, to give additional support and bearing to the under face of the tiles.
    Fig. 2 represents in full size a small portion of two gratings where they rest upon the top of a cross-bar such as is represented by Fig. 4, the rows of glasses along the junction edges of the tiles overlapping the cross-bar B, as shown in Fig. 3, the light of which would he lost but for the lightways a a made in the bars, as described. The novel feature in the junction edges of the tiles is shown in Fig. 3 at g' g' and in Fig. 2 at g' g', where g' g' represent a part of the dead metal at the junction edges of the tiles that is not cut away, but preserved as a bearing-surface to rest upon the top of the bar B and to furnish material for the screws i to take into in fastening the tiles to the bar, the cut-away portion of the junction edges above g' g' making a channel, , Fig. 3, for the waterproofing cement p p, Fig. 3. Another novel feature, and a very important one, is represented by the buttons f' f', the under portion or body of which juts out into the channel h h, filled with the coal-tar-sulphur cement p p, Fig. 3, and thus maintains the regularity of the rows of knobs f f in their distribution over the face of the tiles, the combination of knobs and glasses in regular order all over the face of the tiles producing the unity of design in the surface necessary to make it monomorphous.
    Fig. 7 represents an improved method of constructing the foundation-frame to insure rigidity and prevent leakage at the joints of the tiles. Fig. 8 represents the same when the triangular and lozenge-shaped spaces of the frame are closed by tiles, and Fig. 9 shows the same when finished. The construction represented is concrete; but the tiles employed may be naked metal of the knob style, or any other. The cross-bars of Fig. 7 are drawn with no flutes in the sides; but I design to make them so; and Figs. 4, 5, 6 are to be considered as illustrating the bars of the new frame as well as the bars of the old. B' indicates the duplex character of the supporting-bars B.
    Fig. 8 represents an illuminating-surface construction as the parts are put together at the building. The tiles are all made with no dead borders. Where the tiles come together at their junction edges a recessed surface exists, as is represented by the channel h h, Fig. 3. Where the tile is cast-iron, as in Fig. 3, the recess is a channel, because the surface of the body of the tile between the glasses is in the same plane with the surface of the glasses, as shown in Fig. 3; but the tiles in Fig. 8 are to be faced with concrete, and this concrete facing is to cover all the tiles and all the joints between the tiles and all the junction edges of the tiles, concealing the entire metal of the structure as effectually as a coating of plaster conceals the laths and joints behind it on a plastered ceiling. The face of the tiles of Fig. 8 over the entire work is therefore