The top of this instrument is fitted with lenses and mirrors. Down
through the shaft of the periscope are other mirrors, which pass along
any image reflected on the uppermost mirror of all. At the bottom of
the periscope is the last mirror of the series, and, opening in upon
this, there is an eyepiece fitted with a lens.
As Captain Jack Benson applied his right eye to the eyepiece he was able
to see anything above the surface of the water that lay in any direction
that the periscope was pointing.
"Right opposite Spruce Beach, as the chart showed!" chuckled the young
commander. Under the magnifying effect of the eyepiece lens Benson
could see the beach, the flag-bedecked hotels, and the moving masses of
people on the shore. Yet, all this time, he was out at sea, more than
a mile from the beach. The periscope itself, if seen from a boat an
eighth of a mile away, would undoubtedly have been taken for a floating
bottle.
"Let me have a peep," demanded Somers.
Eph looked briefly, then chuckled:
"Must be thousands of people over yonder, wondering what on earth has
happened to us!"
"Do you make out the gunboat, at anchor to the north of the hotel
section?" inquired Captain Jack.
"Oh, yes. Say, they'll have an awakening on that gray craft, won't
they?"
"If we don't make any slip in our calculations," answered Benson,
gravely.
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