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EXPERIMENTAL GLASS BLOWING

 
large tubes, however, because it leaves a very large lump of glass which may crack on cooling or reheating.
    Practice the following method of closing a large tube; first
Closing a Large Tube
FIG. 31
CLOSING A LARGE TUBE
with a piece of No. 4 tube, then with a piece of No. 6: Attach a working handle to the end to be closed, heat the tube ½ inch from the end in the blowpipe flame, turn constantly, and when soft pull apart until the tube has
Making a Submarine
FIG. 32
MAKING A SUBMARINE
the shape 1, Fig. 31. Heat, turn, and pull the end away to leave the tube as in 2. Heat the end and blow out until it has the shape 3. The end is now closed and the glass has about the same thickness as the remainder of the tube.