Word: all-glass
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Dates: during 1935-1935
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...Tempered glass is made from ordinary plate glass, which is first heated close to the melting point in an electric furnace, then abruptly chilled by blasts of air. The surface, cooling and contracting faster than the inside, becomes a stretched, flexible skin and the inside retains some elasticity because of compression by the skin. Libbey-Owens-Ford has installed under license the special electric furnaces in which tempered glass was first made in Europe. The glass must be cut to size before furnace treatment because after tempering it is crumbled by cutting tools. It can be finished in various colors...