"This may be a sort of clearing-house for the
smugglers."
"That's so. Well, I don't know as we have anything to do with it.
Only if those fellows are using an airship I'd like to know what
kind it is. Well, come on out to the shop now, and we'll see how the
silent motor works."
On the way Tom passed his father, and, telling him not to work too
hard in the sun, gave his parent the piece of paper to read, telling
about the smugglers.
"Using airships! eh?" exclaimed Mr. Swift. "And they think there's a
clew here in Shopton? Well, we'll get celebrated if we keep on,
Tom," he added with a smile.
Tom and Ned spent the rest of the day working over the motor, which
was set going, and bore out all Tom claimed for it. It was as silent
as a watch.
"Next I want to get it in the airship, and give it a good test," Tom
remarked, speeding it up, as it was connected on a heavy base in the
shop.
"I'll help you," promised Ned, and for the next few days the chums
were kept busy fitting the silent motor into one of Tom's several
airships.
"Well, I think we can make a flight to-morrow," said the young
inventor, about a week later. "I need some new bolts though, Ned.
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