FIG. 72
JOINING TWO TUBES
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to blow the eight notes of an octave.
Try to play a tune.
Try to make the most weird sound you can.
Experiment 53. To join two tubes end to end.
Take a piece of No. 2 tube about 7 inches
long, close one end, smooth the other, and when cool, cut the tube at
the middle.
Now join these two pieces as follows: Hold
FIG. 73
WORKING THE JOINT
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the ends opposite each other near the top of the lamp flame (Fig. 72),
rotate constantly, and when nearly red hot bring the ends accurately
together in the flame, press together slightly, draw out slightly, and
remove from the flame.
The ends are now stuck together, but the glass
is in a slight lump around the joint and if allowed to cool will crack
very easily. It is necessary to work the glass back and forth to get
rid of the lump
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