FIG. 34
THE SUBMARINE SHOOTS FORWARD
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just like other fish; namely, they lay eggs, and the little eggs
hatch out after a certain number of days (of course, yours friends
will know that you are only joking). Pretend that you found one
of these submarine eggs, hatched it out in lukewarm water, and that
you have trained the baby submarine to do some simple tricks. For
example, that you have trained it to submerge, rise, and attack,
when you issue the commands "submerge," "rise," and "attack."
Tell them to watch the submarine carefully
and to notice that it takes in water and submerges when you issue
the command "submerge" and, while your friends are watching the
submarine, press down on the stopper unknown to them.
Tell them to watch the submarine carefully
again and to notice that it expels water and rises when you issue
the command "rise."
FIG. 35
A SUBMARINE BATTLE
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Issue the command and unknown to them release the pressure on the
stopper slowly.
Repeat with the command "attack" and
release the pressure quickly.
Experiment 22. A submarine battle.
Make a second submarine, place it in a
large bottle
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