"How long have you been flying?" asked Ralph.
"About two years," said Tom.
"And still they make you fly every day, for practice?" asked Alfred.
"Of course," said Tom.
"And what is that for?" asked Alfred.
"Flying airplanes for war purposes is something different to ordinary flying. The principal practice is to learn the methods of attack and defense. But that is not all. The airplane is the eye of the army; the observer must know how to observe. He must be able not only to see, but to put his knowledge into such form that it can be handed in in the form of a report. While he may get the information he must learn that the information is not for his own gratification, but for the use of the men in the field," said Tom.
"Do all the machines carry a pilot and an observer?" asked Ralph.
"Not by any means," answered Tom. "The first duty of a pilot is to learn how to control his machine when approaching an enemy, and how to attack or to avoid him. For that purpose he has a machine gun which he uses in flying."
"I had no idea that there was so much to do in the business," said Alfred.
"That is only part of the practice," continued Tom. "The most interesting part of the work is to practice flying in squadron formation, to observe the signals of the commanding officer and to execute movements. For this purpose two squadrons oppose each other, and sally forth, the object being to judge the objects of an attacking force and to devise means to repel the enemy."