Lynde, Carleton John, b. 1872, Gilbert, A. C. (Alfred Carlton), 1884-1961, A.C. Gilbert Company · New Haven, CT : A.C. Gilbert Co. · leaf 15
FIG. 21SECOND STEP IN MAKING WINDOW PANES GLASS BLOWING 13 potash, and lime; and crystal or flint glass, from sand, potash,and lead oxide. |—1C/20K\ … FIG. 22IRONING THE CYLINDERS FLAl 14 BOY ENGINEERING HOW ARE THINGS MADE OF GLASS ? The glass mixture is heated tc a high temperature in fire claypots or tanks in large ovens. The surface is skimmed from timeto time and the heating is continued until all air bubbles haveescaped from the mixture,…
Glass blowing and working
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