Glass and Glass Manufacture

acid action alkali allowed alumina annealed glass annealing antimony aventurine barium batch materials blocks blow-iron borates bulb cent chemical cobalt oxide coloured glass combustion composition cool copper covered pots cracked crown glass cryolite crystal glass cullet cylinder decolorizers decorating enamels fire fire-clay flame flux fuel furnace fused gas-fired gathering gives glass house glass maker glass manufacturers glass trade glass workers GLASS-MELTING FURNACE glassmaking glassware ground heat Hermansen hot glass hot metal hydrofluoric acid iron lead crystal lead oxide lehr lime machine manganese oxide marver melting method molten mould nickel oxide obtained opal optical glass oxidising parrison pieces plastic polished pontil portions pot-clays potash potash carbonate present proportion purple colour re-heating Recuperative reducing refractory materials regenerative sand shape siege SIEMENS SIEGBERT silicate soda-lime glasses spun glass Stourbridge surface takes tank temperature thickness thin tint tumblers type of furnace ware whilst wine-glass workman