isn't Mr. Fenwick!"

"Mr. Fenwick?" gasped Tom.

"Yes. The inventor we came to see!"

At the same moment the newcomer cried out:

"Wakefield Damon!"

"That's who I am," answered Tom's friend, "and let me introduce you
to Mr. Swift, the inventor of more machines than I can count. He and
I were coming to see you, when we had a slight accident, and we
landed here. But that didn't matter, for we intended to land here
anyhow, as I knew it was near your house. Only we had to vol-plane
back to earth, and I can't say that I'd care for that, as a steady
diet. Bless my radiator, but I'm glad we've arrived safely."

"Did you come all the way from your home in that?" asked Mr. Fenwick
of Tom, as he shook hands with him, and nodded at the monoplane.

"Oh, yes. It's not much of a trip."

"Well, I hope my airship will do as well. But something seems to be
wrong with it, and I have hopes that you can help me discover what
it is, I know your father, and I have heard much of your ability.
That is why I requested your aid."

"I'm afraid I've been much overrated," spoke Tom, modestly, "but
I'll do all I can for you. I must now leave my monoplane in a safe
place, however."

"I'll attend to that," Mr. Fenwick hastened to assure him. "Leave it
to me."

By this time a lieutenant of police, in charge of several reserve
officers, had arrived on the scene, for the crowd was now very
large, and, as Mr. Fenwick knew this official, he requested that
Tom's machine be protected from damage. It was arranged that it
could be stored in a large, empty shed, and a policeman would be
left on guard. Then, seeing that it was all right, Tom, Mr. Damon
and Mr. Fenwick started for the latter's house.

"I am very anxious to show you the WHIZZER," said Mr. Fenwick, as
they walked along.

"The WHIZZER?" repeated Tom, wonderingly.

"Yes, that's what I call my electric airship. It hasn't 'whizzed'
any to speak of yet, but I have hopes that it will, now that you are
here to help me. We will take one of these taxicabs, and soon be at
my house. I was out for a stroll, when I saw your monoplane coming
down, and I hastened to Franklin Field to see it."

The three entered an automobile, and were soon being driven to the
inventor's home. A little later he led them out to a big shed which
occupied nearly all of a large lot, in back of Mr. Fenwick's house.

"Does it take up all that room?" asked Tom.

"Oh, yes, the WHIZZER is pretty good size. There she