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Rh hind a little screen of trees, and were gazing into the open place. They saw several men at work erecting some sort of tower, or pile of rocks, and on top of it was mounted a large lantern.

"There—that ought to show pretty well," remarked one of the men.

"Yes, and be seen a good distance out to sea," put in another. "It's just in the right place, too; for the rocks extend a good way out, and you can't see 'em even at dead low water."

"And anything drawing more than ten feet will be sure to strike on 'em," suggested a third.

"That's right, Sandy," came the retort. "Have you got the lantern fixed so that she'll flash like the other?"

"I sure have. All we've got to do is to pull one wire—this way—and the light is shut off. Another pull, and she gives a flash, just like a revolving light."

"Good. We'll give it a trial to-night."

"Say, what do you think they are?" whispered Joe.

"I hardly know, and yet"

"Maybe they're experimenting with a new kind of light?" suggested the other lad.

"Experimenting? Yes!" spoke Blake, in a low tense voice. "And I can guess what they're experimenting for."