While Somers was busy putting the foreman and the machinists ashore, Mr.
Farnum, Jack and Hal remained on the platform deck, watching the approach
of the naval vessel, which was now plainly making for Dunhaven.

Suddenly, a broad beam of glaring white light shot over the water, resting
across the deck of the “Farnum.”

“I guess that fellow knows what he wants to know, now,” muttered Benson,
blinking after the strong glare had passed.

“There, he has picked up the ’Pollard,’ too,” announced Hastings. “Now,
that commander must feel sure he has sighted the right place.”

“There go the signal lights,” cried Captain Jack, suddenly. “Hal, hustle
below and turn on the electric current for the signaling apparatus.”

Then Benson watched as, from the yards high up on the gunboat’s signaling
mast, colored electric lights glowed forth, twinkling briefly in turn.
This is the modern method of signaling by sea at night.

“He wants to know,” said Benson, to Mr. Farnum, as he turned, “whether
there is safe anchorage for a twelve-hundred-ton gunboat of one hundred
and ninety-five feet length.”

Reaching the inside of the conning tower at a bound, the young skipper
rapidly manipulated his own electric signaling control. There was a low
mast on the “Farnum’s” platform deck, a mast that could be unstepped
almost in an instant when going below surface. So Captain Jack’s
counter-query beamed out in colors through the night: