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Show Substitutes for Glass. Materials of many kinds, more or less transparent, are being tried In Europe to replace window glass, which is unobtainable. Cellulose films are made practical by mounting on metal gratings, light wire screen, or cloth. Glue Interlaced with hemp strands between be-tween two sheets of paper: albumen and casein products; sheet gelatin, and an artificial resin made by condensing phenol with n formaldehyde solution, all are imperfect but ready makeshifts, More nearly resembling glass, but comparatively expensive, are an oxide of silica made by fusing it with acid oxides of titanium or zirconium, and n combination of greensand marl with magnesia, bauxite, and an alkali, melted melt-ed in an electric furnace. Some of these glass substitutes are flexible. Popular Mechanics Magazine. |