wonder what it will be next?"

The boys were congratulated on their success by Mr. Hadley and Mr.
Ringold, and the films, when developed and printed a little later,
furnished a series of fine views.

For the next week the boys had little time to themselves. The drama
with the burning shack was enacted over again, this time with success,
the volunteer firemen not throwing any water on the blaze. Other sea
dramas were also made, and then came a period of rest, in which Blake
and Joe had hardly anything to do.

"Say," exclaimed Blake, one afternoon, "let's go for a walk down the
beach, by the cliffs. It's a fine day and it will do us good."

"All right," agreed Joe. "I was thinking of paying another visit to the
lighthouse, and asking if there was any news of my father; but, of
course, there can't be."

"Hardly," agreed Blake, thinking that the only news his chum would get
there would be bad.

They strolled along the shore, making excursions here and there as
something attracted them. Going through a little group of scrub oak,
somewhat back from the shore, and climbing a slight elevation to get a
view of the Pacific, the boys were startled, as they were about to
emerge into a little open glade, to hear voices.

"Some one else besides us out here to-day," spoke Joe, in a low voice.

"That's right," agreed his chum. "Keep still until we see who it is."

Cautiously they advanced until they stood behind 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.

"Experimentin