Crack-ger-ack-ack-ack! Crack-ger-ack-ack-ack! whined the spark as the boy alternately depressed and released the sending key. Then he switched over to “listen in.”

But no answering sounds beat against his ears. The signal had, apparently, fallen still-born on the wings of the storm. This went on for some fifteen minutes and then Jack gave up for a time.

“Nothing in our field or else my waves are too weak,” he explained to young Raynor, who listened with interest.

“I don’t understand what your wireless gibberish means,” he laughed, “but if you’ll teach me, I’ll learn some day.”

“Sure you will,” said Jack cheerfully; “it’s as easy as rolling off a log.”

“Yes, when you know how,” rejoined Raynor.

They sat silently for a time, while Jack again tried to raise some other ship, but without success.

“Looks as if the ocean must be empty just about here,” he commented.

“Would you be bound to get in touch with another ship if there was one within range of your instrument?” asked young Raynor presently.

“Not necessarily. There might be a dozen things that would interfere.”