tuning knob. But then came a faint buzz like the humming of a drowsy
bee. Suddenly, sharp and distinct, as if his father was at his elbow,
came Mr. Chadwick's voice in reply:

"Hullo!"

"This is the Wondership. Three thousand feet in the air," cried Jack.

"Congratulations, my boy. It's a success so far."

"What shall we do now?" asked Jack.

"I want you to fly in the direction of Rayburn, and try to keep in
communication all the way."

"All right, dad," responded Jack, and altered the course of the
Wondership.

Rayburn was a small village some twenty-five miles to the north of
Nestorville. Jack kept the receivers on his ears as he flew along.
From time to time he exchanged conversation with his father. So far
everything appeared to be working as if there were no limit to the
distance over which the voices from the air and land could converse.

But suddenly there came a startling interruption to the experiments.

Jack felt a sharp "Bang" at his ears as if a small cannon had been
fired close at hand.