The speed of a torpedo like this,
under water, is a good deal better than thirty miles an hour, but the
distance the torpedo can go is naturally short. That is a direct
consequence of its speed. Now, Mr. Benson, would you like to know how
to fire the torpedo, since it is already in the tube?"
"Certainly, sir," nodded Jack. And then he continued as if reciting a
lesson: "Just give that firing lever at the back of the after port a
quick shove to the right and downward. That releases the charge of
compressed air and forces the torpedo out. At the same instant the
forward port opens, so that the torpedo can be shot out into the water.
The compressed air also serves to keep the sea water from rushing in
through the torpedo tube. When the lever is swung up and back again
that closes the forward port, and it is then safe to open this after
port."
"You've committed that to memory," laughed the naval lieutenant.
"Oh, we've often talked this over, all three of us," smiled Jack.
"Then, since you understand this part so well, Benson," proposed Mr.
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