the rescue, and proceed to the place of the winds to try his air glider, it seemed as if dusk would never come as they remained in concealment.
But night finally approached and then the great airship went silently aloft, ready to hover over the prison ground. Fortunately there was little wind, and she could be used as a balloon, thus avoiding the noise of the motor.
"The next thing I do, when I get home," remarked Tom, as they drifted along, "Will be to make a silent airship. I think they would be very useful."
With Mr. Borious in the pilot house, to point out the way, Tom steered through the fast-gathering darkness. The Russian had soon become used to the airship, and was not at all afraid.
"Can you go just where you want to, as a balloon?" asked the new guide.
"No, but almost," replied Tom. "At the last moment I've got to take a chance and start the motor to send us just where we want to go. That's why I think a silent airship would be a great thing. You could get up on the enemy before he knew it"
"There are the prison barracks," said the guide a little later, his talk being translated by Mr. Petrofsky. Below and a little ahead of them could been seen a cluster of lights.
