CHAPTER XV
THE PICKED SQUADRON
"All ready, Jack?"
"Just a moment, Tom. I want to go over my struts and wires to make sure everything is taut. I don't want any accidents."
"That's right. Got plenty of ammunition drums?"
"All I can carry. I've got some tracer bullets, too."
"That's good. Glad you reminded me of them. I must put in a stock. The last time I went up I wasted a drum before I got my man."
Tracer bullets for aircraft guns, it might be observed, are balls of fire which enable the pilot to see the course his machine gun bullets are taking, so he may correct his fire.
"Well, how about you now?" asked Tom, as he added these useful supplies to his ammunition.
"I guess we're ready to start," replied Jack.
They climbed into their machines, each pilot using a single-seat, swift-flying craft, equipped with a Lewis machine gun. The squadron was going out on patrol duty, and each pilot was to
