the book. Does the water run from both tumblers to the lower tumbler
until the levels are again the same?
Experiment 58. To make a repeating air gun.
Take a full length of No. 4 tubing, put a
branch about 3 inches long at a point about 2 inches from one end;
FIG. 81
BALANCING COLUMNS
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leave the end of the branch closed (Fig. 78). Now
load the branch with shot or coarse dry sand, and your repeating air
gun is ready for use.
Tilt the branch slightly above the horizontal
and blow intermittently. Does your gun reload after each blow, until
the ammunition is used up?
Experiment 59. To make a four-way junction.
Make a tee as in Experiment 56,
but do not cut off the closed ends. Now attach a fourth arm,
as in Fig. 79, and heat and blow gently as before
to work the glass into uniform condition. Cut off the closed arms at
equal lengths, smooth the ends, and your four-way junction is made.
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