one off in a straight line. The same thing must be done in an
airship. That is, it must be inclined at an angle in making a
curve.

And this is accomplished by means of bending down the tips of the
planes, pulling them to the desired position by means of long wires.
It can also he accomplished by small auxiliary planes, called
alerons, placed between the two larger, or main, planes. There is
an aleron at the end of each main wing.

Straight ahead flew the army men and Dick, and then, when the cadet
was more used to it, they went around on a sharp curve. It made the
young millionaire catch his breath, at first, for the airship seemed
to tilt at a dangerous angle. But it was soon righted and
straightened out again.

Suddenly a shadow seemed to pass over Dick's head. He looked up,
thinking it was a dark cloud, low down, but, to his surprise, it
was the other army craft flying above them.

"A race!" thought Dick, and he wondered how his chum Paul was
faring.

There was an impromptu race between the two aircraft, and then they
separated, neither one gaining much advantage. Back and forth they
went, over the school grounds, and then in circles. Dick was
rapidly acquiring knowledge of how to operate the big biplane.

"We'll go down now!" spoke the captain, though Dick could not hear
the words. The young millionaire made up his mind that he would