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      “On the contrary, at night and on foggy days, the Hertzian waves are sometimes most powerful. All things being equal, though, they work better over the sea than the land.”

      “What is the longest distance a message has ever been sent by wireless?” was young Raynor’s next question.

      “The last one I heard of was seven thousand miles. At that distance a ship off the coast of Brazil heard a call from Caltano, Italy. Think of that! That message had traveled across Italy, over the Mediterranean, slap across the northwestern part of Africa, and then went whanging across the Atlantic to a spot south of the Equator!”

      “Going some,” was young Raynor’s comment.

      “But that isn’t the most wonderful part of it. If that message went seven thousand miles in one direction, it must have gone an equal distance in an opposite one. That would make it encircle almost half the world.”

      “Curves and all?” asked Raynor.

      “Curves and all,” smiled Jack.

      “And how fast does this stuff – the electric waves, I mean – travel?” asked the young engineer.

      “Well,” said Jack, “it is estimated that a message from this side of the Atlantic would reach the Irish coast in about one-nineteenth of a second.”

      “Oh, get out! I’m not going to swallow that.”

      “It is true, just the same,” said Jack. “I know it is hard to believe; lots of things about wireless are.”

      “Well, I mean to learn all about it I can.”

      “You’ll find it well worth your while.”

      “I believe that it is the most fascinating thing I’ve ever tackled.”

      “In the meantime, I wish I could raise a ship,” grumbled Jack, again sending out his call.

      “If we were sinking or in urgent difficulties right now, would you stick on the job till we raised some rescue ship?”

      “I hope so. I’d try to,” said Jack modestly. “The history of wireless shows that every operator who has been called upon to face the music has done so without a whimper.”

      While he worked at the key and the spark sent out its crepitant bark, young Raynor peered out at the tumbling sea through the port of the wireless cabin.

      “Hullo!” he exclaimed presently, “we’re swinging round.”

      “I can feel it,” said Jack, as the Ajax, instead of breasting the seas, began to roll about in the trough of them.

      The heavy steel hull rolled until it seemed that the funnel and the masts must be torn out by the roots. Both boys hung on for dear life. After a while the motion became easier.

      “Good thing I’m not inclined to be sea-sick,” said Jack, “or this would finish me.”