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144 pleasure unless it is equipped with an up-to-date wireless telephone for the use of pilot and observer.

Jack himself had contrived some amateur device of this sort which he rigged up as soon as he seated himself back of Tom, although up to then he had failed to make use of it.

The roar of many propellers and the steady hum of a score of engines combined to make a deafening noise. Nevertheless, when Tom felt a tug at his sleeve, such as had been agreed upon with his chum, he took hold of his little receiver and was delighted to hear Jack's voice as plainly as though there had been no interference.

Plainly then Jack's idea was bearing fruit, and properly cultivated there might be something worth while in the scheme.

"Tom, do you get me?" demanded the agitated inventor, the first thing.

"Yes, and plainly, too," came the reply that greatly pleased Jack; for up to then they had found no occasion to test the wireless telephone under severe conditions.

If it "made good" with all that noise about them. Jack felt that he ought to call it a success.

"That's right!" he told Tom, exultantly. "I never missed a syllable that time. Oh, boy! it seems as if it's O K, doesn't it?"

"Splendid thing for talking when you're