"Wow! Who did that!"

"I'm blinded! The shed is falling down!"

"Run fellows, run!" screamed Andy. "There's been an explosion. We'll
be killed!"

At that moment the big doors of the shed were thrown open, and Mr.
Sharp came in. He started back in astonishment at the sight of the
three grotesque figures, their faces black with the soot, and their
clothes covered with sawdust and shavings, rushing wildly around.

"That will teach you to come meddling around here. Andy Roger!" cried
Tom.

"I-I-you-you-Oh, wait-I-you-" spluttered the bully, almost speechless
with rage. Sam and Pete were wildly trying to wipe the stuff from
their faces, but only made matters worse. They were so startled that
they did not know enough to run out of the opened doors.

"Wish we had some more stuff to put on 'em," remarked Ned, who was
holding his sides that ached from laughter.

"I have it!" cried Tom, and he caught up a bucket of red paint, that
had been used to give the airship its brilliant hue. Running to the
end of the loft Tom stood for an instant over the trio of lads who
were threatening and imploring by 'turns.

"Here's another souvenir of your visit," shouted the young inventor,
as he dashed the bucket of red paint down on the conspirators. This