"We'll lie right here and watch him awhile," he told his executive
officer. "Pretty soon he'll be close enough for us to get a line
on his silhouette."

It had been an interesting revelation to the Brighton boys soon after
their entry into the navy to learn that each ship was equipped with a
silhouette book. By means of this it was possible to tell the
vessels of one nation from another by the size and formation of their
hulls, their smokestacks and general outline. Each officer had to be
thoroughly well informed on the contents of the book.

Quietly, stealthily the hidden submarine awaited the approach of her
adversary, for it seemed only too certain that the ship that had
suddenly come dashing up out of the east was out of Cuxhaven or
Wilhelmshaven, and had but a short time before passed under the
mighty German guns on Heligoland.

Chief Gunner Mowrey and his crew in the torpedo chamber forward were
signaled to "stand by the guns ready for action," which meant in this
case the huge firing tubes and the Whitehead torpedoes. Jack and Ted
fell into their places, stripped to the waist, and making sure that
the reserve torpedoes were ready for any emergency.

By adjusting the headpiece of the ship's microphone to his ears Chief
Electrician Sammy Smith kept close tabs on the approaching vessel
with the underwater telephone. With the receivers to his hears he
could hear plainly the swish of the vessel's propeller blades as she
bore down upon the floating submarine. With his reports as a basis
for their deductions, the _Dewey's_ officers were able to figure out