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making of glass, will probably be unable to give the narrative much credit.
    There are three kinds of glass in common use, all containing-- (1) sand (silica), as the acid element; (2) soda or potash, as the alkaline "base"; (3) lime or oxide of lead, as the alkaline earth.

FLINT-GLASS

--made of sand, 100 parts; red lead, 70 parts; potassium carbonate, 33 parts-- is employed mainly for the manufacture of tumblers and other tableware, and for ornamental objects. It has a naturally brilliant surface, which is improved by cutting and polishing on grindstones and emery wheels. The presence of the lead renders it fusible at a comparatively low temperature, and so particularly suitable for the manufacture of pressed goods.

CROWN-GLASS

--sand, 100 parts; carbonate of soda, 33 parts; lime, 15 parts; cullet, or glass scrap, 100 parts-- is used for plate or window glass.

BOTTLE-GLASS

    For common bottle-glass the materials generally