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How It Is Made
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plate is determined by two parallel moving guides with ends cut to fit the roller. To roll a plate, a large pot of metal is drawn from the furnace and poured out on the table in front of the roller and between the guides.

Pouring molten glass on to table for rolling.
Fig. 58.--Pouring molten glass on to table for rolling.

The roller advances, pushing before it the guides and all the glass except what is required to make a layer as deep as the distance between the roller and the table, the guides preventing the glass from spreading laterally.
    The plate so obtained has uneven, wavy faces, and consequently is not transparent. After being