"And I think I know who it is!" exclaimed Jack.
"Who?" asked Mr. Henderson.
"The crazy machinist. I believe he sneaked here through that open port leading into the storeroom."
"That's it!" cried Mr. Roumann. "He must have done this. See if you can't find him."
"Come on, Mark," said Jack. "We'll look for the rascal."
"And I'll help," added old Andy. "I'm pretty good on the trail. Maybe I can locate him."
"Do so, then," advised the German. "The professor and I will repair the motor."
CHAPTER XVIII
A VAIN SEARCH
The boys, with the old hunter, immediately began a search. Washington was needed to aid the two scientific men, who quickly prepared to substitute new plates for the smashed ones. The broken plates looked as if they had been struck with a sledge hammer.