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317,077 · Belcher · "Mosaic of Glass and Lead Glazing" · Page 2
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asbestus from the sides of the said sheet metal and glass pieces, and allowing the said frame metal to flow between to the injury of the said mosaic.
    The molds, as above intimated, are in duplicate, a being the back-metal chamber surrounded, except at the mouth, by a lining of asbestus felt or other non-combustible material, b' b", of any suitable thickness. Each of the duplicate parts of said mold is provided with a feeding-channel, t, branch passages t', through which the molten metal flows to the channels or passages between the glass, and vents or outlets t" for the escape or air, gas, or superfluous metal. Said channels, passages, and outlets are formed by suitable sheets or strips of asbestus felt u.
    C indicates the gummed or adhesive sheets before referred to. D are the clamping-surfaces having a suitable non-combustible lining, e, and F are clamps binding the whole together.
    In preparing the surface or finishing metal of the frame-work, I prefer to coat the thin sheet metal from which it is obtained with varnish, and then mark or trace upon the varnished surface with a suitable steel point or tool the desired pattern of the frame-work. I thus expose the metal to the action of acids, which, when applied, cut through the metal at said lines or tracing-marks and sever the frame from the body of the sheet.
    The core portion of the frame-work may be covered with a superficial metallic finishing covering in any other way-- for example, by nickle-plating. When a sheet-metal covering is employed, the same may be prepared to cover the channels in any suitable manner. For example, when I wish to employ said covering with projecting jewels, as in Fig. 7, I may stamp out with a die or tool holes or perforations of a size to receive the projecting portions of the jewel, but catch the shoulder thereof. A second corresponding sheet may be placed on the under side to cover the under edges of said jewel and the whole united by molten metal, as in the manner before described, or in any other manner.
    To give coherency and increased stiffness to the mosaic, so that it is better able to resist the influence of the wind or other lateral pressure, I may insert or cast flat steel wire, similar to that known as "hoop-skirt wire," transversely in the frame, as shown at p, Fig. 7. This, while being generically similar to the core-wire in my former patent above mentioned, is specifically an improvement thereon, in that it adds increased lateral stiffness to the mosaic.
    Having thus described the invention, what I claim as new is--
    1. In a mosaic for windows and other purposes, the combination, with the mineral plates A, of a cast-metal frame-work having a superficial metallic finishing-covering, substantially as set forth.
    2. As an improved article of manufacture, the mosaic consisting of glass or mineral plates having a cast-metal frame-work provided with a sheet-metal facing, substantially as set forth.
    3. A mosaic consisting, essentially, of glass or mineral plates having a metal frame-work to hold said plates together, said frame being of cast metal between the edges of said plates and of sheet metal at the exposed surfaces, said sheet metal overlapping the plates to more securely hold the same in position.
    4. In a mosaic, the flat-wire core cast transversely in the frame-work, substantially as shown and described.
    5. The process of manufacturing mosaics of glass or other mineral plates, to wit: of arranging saw-plates in a separated relation to one another between clamping-surfaces provided with a back metal receptacle or chamber separate from the glass, of filling said receptacle with molten metal to raise the temperature of the glass and mold and secure a uniform resistance to the frame-metal, and filling the channels between said plates with molten metal, substantially as and for the purposes set forth.
    6. The process of forming mosaics of glass or other mineral plates, to wit: arranging the glass between sheets of asbestus or other suitable sheets, arranging duplicate sets of said sheets, with the glass between apart, in a mold to form a chamber between said sets, filling said chamber with molten metal, and subsequently casting a frame-work to unite the said glass plates, as set forth.
    7. The process of forming mosaics, to wit: of arranging mineral plates in a separated relation to one another to form channels or passages between, covering said channels with sheet metal, fixing the relations of said parts with an adhesive sheet, arranging the whole in a suitable mold, and casting a metallic frame-work in said passages to unite said mineral plates and sheet-metal covering, substantially as set forth.
    8. The process of manufacturing metallic frame-work around mineral plates or portions in a mosaic, to wit: arranging said plates or portions in a separated relation to each other to form passages between, covering said passages with sheet metal, and casting molten metal in said passages to bind the parts together, substantially as set forth.
    9. In the process of manufacturing mosaics of glass or other mineral plates, the process of raising the temperature of said plates and holding the asbestus clamping-sheets in close engagement with the sides thereof by casting a molten back metal at the sides of said clamping-sheets opposite said glass portions prior to casting the frame metal, as set forth.
    In testimony that I claim the foregoing I have hereunto set my hand this 14th day of August, 1884.