Then he happened to remember that in an electric
battery, to obtain more power, you must pull out a certain pin.
"Perhaps this works like an electric battery," he said. "I'll
pull it out."
He did so, and a surprising thing happened. The boat shot
forward at enormous speed, and as Jack happened to pull the pin
out at a time when the craft was high up, it began to shoot
across the water at an angle to the whirlpool. He had solved the
problem of how to escape. As he afterward learned, the pin was
just for the purpose for which he used it--to cause a sudden
increase in speed.
The whirlpool did not give up without a struggle, but the boat
was finally successful, and fought its way out to calm water.
"How did you do it?" asked Mark, and Jack told them.
"Well, we'd better start back for the city," proposed Mr.
Roumann. "I guess we've had enough for one day. We'll try
again, and take some other route."
"There's no need of that," declared Professor Henderson. "See, we
are close to the hills now. We have crossed the whirlpool. Why
not go on, and see if we can't find some Cardite? Going back now
will be no easier than after we have made an examination.
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