"Just look at the sweep of the planes," exclaimed Barney. "They were made for high altitude work—up where the air's thin. No one would be coming up here for a high altitude test, would he?"

"Surely not; there's no particular advantage at this point for that."

The boys watched the unloading with eager and experienced eyes. As Barney put it, "Makes me feel like some shipwrecked gob on a desert island when he sees a launch coming ashore."

"Yes," grinned Bruce, "and soon you'll be feeling like your gob would when the launch came about and put out to sea again. No chance for you on that boat, Barney."

"Guess you're right," groaned Barney. "Little enough we'll have to do with that bird."

As he spoke several of the men recklessly jerked a plane to free it from its wrappings. The Major, his back to them, was superintending the unloading of the Liberty motor.

"Hey, you! Go easy there!" Barney sprang forward impulsively and showed the workmen how to handle the plane. When the job was done he stepped back with an apologetic air. The Major had turned and was watching him.

"You seem to understand such matters," he smiled.

"I've worked with them a bit," said Barney.

"Would you mind letting me know where you are located?" asked the Major. "My aviator and mechanic have disappointed me so far. You might be of some assistance to me."