is!" cried Mr.
Fenwick proudly, as he threw open the doors of the shed, and Tom and
Mr. Damon, locking in, saw a large triplane, with a good-sized gas
bag hovering over it, and a strange collection of rudders, wings and
planes sticking out from either side. Amidships was an enclosed car,
or cabin, and a glimpse into it served to disclose to the young
inventor a mass of machinery.

"There she is! That's the WHIZZER!" cried Mr. Fenwick, with pride in
his voice. "What do you think of her, Tom Swift?"

Tom did not immediately answer. He looked dubiously at the electric
airship and shrugged his shoulders. It seemed to him, at first
glance, that, it would never sail.

CHAPTER VII

MAKING SOME CHANGES

"Well, what do you think of it?" asked Mr. Fenwick again, as Tom
walked all about the electric airship, still without speaking.

"It's big, certainly," remarked the lad.

"Bless my shoe horn! I should say it was!" burst out Mr. Damon.
"It's larger than your RED CLOUD, Tom."

"But will it go? That's what I want to know," insisted the inventor.
"Do you think it will fly, Tom? I haven't dared to try it yet,
though a small model which I made floated in the air for some time.
But it wouldn't move, except as the wind blew it."

"It would be hard to say, without a careful examination, whether
this large one will fly or not," answered Tom.

"Then give it a careful examination," suggested Mr. Fenwick. "I'll
pay you well for your time and trouble."

"Oh if I can help a fellow inventor, and assist in making a new
model of airship fly, I'm only too glad to do it without pay,"
retorted Tom, quickly. "I didn't come here for that. Suppose we go
in the cabin, and look at the motor. That's the most important
point, if your airship is to navigate."

There was certainly plenty of machinery in the cabin of the WHIZZER.
Most of it was electrical, for on that power Mr. Fenwick intended to
depend to sail through space. There was a new type of gasolene
engine, small but very powerful, and this served to operate a
dynamo. In turn, the dynamo operated an electrical motor, as Mr.
Fenwick had an idea that better, and more uniform, power could be
obtained in this way, than from a gasolene motor direct. One
advantage which Tom noticed at once, was that the WHIZZER had a
large electric storage battery.

This was intended to operate the electric motor in case of a break
to the main machinery, and it seemed a good idea. There were var