Experimental glass blowing for boys

by Carleton John Lynde

FIG. 23
BOTTLES BLOWN IN A MOLD

The flat sheets are finally annealed in a third oven for a number of days and are then cut into panes, sorted, and packed.

GLASS TUBES

FIG. 24
ROLLING PLATE GLASS

The glass tubes with which you do the experiments in this book are made in the same way as window glass up to the stage of blowing the cylinder; then the blower’s helper attaches an iron rod to the opposite end of the cylinder (see right of Fig. 1), and the blower and helper walk backward away from each other to pull the cylinder into a tube. Of course, they use a small amount of glass to make small tubes, and larger amounts for large tubes.

MOLDED GLASS

Many articles of glass are made by blowing the glass in molds. Bottles are made in this way (Fig. 23), and large machines are now in use which mold many bottles at one time in this way.

PRESSED GLASS

Many articles are made by pressing glass into molds, that is, the molten glass is poured into molds and is pressed against the sides of the mold by means of a plunger. Imitation cut glass is pressed in this way.