"
"That's so."
"I'll make an affidavit that there ain't a person on this airship
but ourselves," declared Andy.
"Let's ask Mr. Roumann if it's possible that the motor smashed
itself," proposed Jack, and, having no further place to search,
they went back to where the two scientists and Washington were
busily engaged.
"Yes," replied Mr. Roumann, after Jack had stated his question.
"It's possible for that to have happened, but not very probable.
I think some person is hiding on board here, and that he did it."
"But we can't find any one."
"That may be. He is well concealed. Well you can't do anything
more. Suppose you two boys turn in and help us?"
Jack and Mark were glad to get busy, and for several hours they
labored in the engine-room, where the two scientists were
toiling. As this rendered it unnecessary for Washington to be
there, the colored man went to his kitchen, while Andy again made
a vain search of the projectile, looking for the crazy man.
Though Mr. Roumann had provided duplicates of the power plates
for the Etherium motor, it was quite a task to take out the
broken pieces and insert the new ones.
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