FIG. 100
MAGIC
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hold your finger over the lower end of the tube, suck as much air as you
can out of the tube, pinch the coupling, and remove your finger under
water. Does the atmosphere drive water up the tube very rapidly and
with great force?
Experiment 75. A fountain.
With the apparatus Fig. 99
suck as much air as you can out of the bottle, pinch the coupling, and
open it under water. Does the atmosphere lift the water into the bottle
and produce a beautiful fountain?
FIG. 101
MORE MAGIC
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Experiment 76. Magic tumbler.
Fill a tumbler with water, cover it with a sheet
of paper, hold the paper on with your hand, invert the tumbler, and remove
your hand (Fig. 100). Does the atmospheric pressure upward support the
paper and water?
Experiment 77. Magic lift.
Fill a tumbler with water, press your palm down
on top with your fingers pointing downward (Fig. 101), straighten your
fingers without admitting air to the tumbler, and then lift your hand.
Do you lift the tumbler of water also?
There is a partial vacuum between your hand and
the water and the
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