into a coupling or stopper, because if you hold it too far back you
may break it. Insert it with a twisting motion, after wetting the
end and the inside of the coupling or stopper.
FIG. 68
A SYRINGE
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Wet the inside of the large tube, wet the
plunger and rub it on a cake of soap to make it slippery, then try it
in the large tube. if the plunger is too large, stretch the coupling
lengthwise; if it is too small, crowd the coupling together
lengthwise. if the bulb is too large or too small, dry it, heat it in
the blowpipe flame until it shrinks, and blow another.
When the plunger is made, attach a No. 4 nozzle
to the No. 6 tube with a large coupling, arrange as in Fig. 68, and
your syringe is made.
Fill the large tube with water and see how
long a stream you can make.
FIG. 69
ANOTHER SYRINGE
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Experiment 49. To make another syringe.
Heat a piece of No. 6 in the blowpipe flame
at a length of 7½ inches and draw it out into a nozzle; smooth
the outer end in the lamp flame. Use the same plunger as in Experiment
48, and your syringe is made (Fig. 69). Try it out with water.
Experiment 50. To make a third syringe.
Heat a piece of No. 6 tube in the blowpipe
flame at a length of 7½ inches, draw it out, and close the
end, then smooth the other end.
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