"Better not touch anything," advised Sammy, as Bob put out his hand to examine one of the tubes with glass in the end.
"Why not?" was asked.
"Because you might get a shock."
"A shock? How do you make that out?"
"Why there's some electric batteries attached to the things," said Sammy, pointing out the dry cells in their red pasteboard boxes.
"That's right," agreed Frank. "They're the same kind of batteries Jerry Grow has in his motor-boat. And they can give you a fierce shock, too."
"What, those little things?" asked Bob, in surprise.
"Sure," spoke Sammy. "You see the batteries aren't so strong in themselves, but when you run the current through a production coil"
"Induction coil—not production," corrected Frank.
"Well, induction coil then," went on Sammy. "When the current from the electric battery goes through that, it gets stronger, and it sure does hurt."
"I know it does," agreed Bob, "for I got stung once on Jerry's boat, when he was putting in some new batteries. Oh, I won't touch these!"
Look as they did at the strange apparatus, the boys could not understand what it was for, unless, as Sammy said, it was used for making false money. Of course the chums had never seen any machinery for that purpose, and had no idea what was necessary. But Sammy's idea appealed to them.
"I guess we'd better be getting out now," said Frank, after a bit. "I shouldn't like to be caught here."
"Me either!" agreed Bob. "Let's go."
The boys started out of the mysterious room, excited over their strange find, Sammy in particular. This trip to Pine
