m the nearest army aviation grounds, and had a most
successful flight. I must send back word to Major Dalton."

"Our telephone, or telegraph service, is at your disposal," said
Colonel Masterly. "If you will come with me--"

"Excuse me, but we carry with us our own means of communication," said
Captain Grantly with a smile. "We are going on the assumption,
constantly, that we are in an enemy's country.

"Consequently we go prepared as though there were a state of war. We
shall communicate with our base by means of wireless."

"I am afraid we can't accommodate you there," went on the head of the
military school. "We are installing a wireless outfit, but it is not
yet completed," the colonel said.

"Oh, we carry our own!" was the unexpected retort. "Lieutenant Larson,
if you and Lieutenant McBride will get the balloon ready, Captain
Wakefield and myself will work out the cipher dispatch, and send it.

"We use a code in our wireless," he went on to explain, "and it takes a
few minutes to make up the message."

"But I heard you speak of a balloon," said Colonel Masterly. "I don't
see how you carry one on your machine."

"Here it is," was the answer, and a deflated rubberized silk bag was
produced from a locker back of the pilot's seat. "This is the latest
idea in airship wireless," went on Captain Grantly, as he directed the
lieutenants to get out the rest of the apparatus. "We carry with us a
deflated balloon, which will contain about two hundred cubic yards of
lifting gas. The gas itself, greatly compressed, is in this cylinder.
There's enough for several chargings.

"We fill the balloon, and attach to it our aerial wires. The balloon
takes them up about four hundred feet--the wires weigh about twenty
pounds, I might say. Then we carry a light sending instrument. It has
a considerable range, though we can receive messages from a much
greater distance than we can send, as our force for a sending current
is limited."

As he was talking the others were working, and the cadets looked on
interestedly. The drill had been abandoned, and officers and students
crowded up near the army aviators to see what was going on.

With a sharp hiss the compressed gas rushed from the containing
cylinder into the deflated balloon. The silken sides puffed out,
losing their wrinkles. The balloon gradually assumed larger
proportions.

"Ready with the wires?" asked Captain Grantly.

"All ready, sir," replied Lieutena