"But mind, no hard work for three or four days," insisted the physician. "I want your heart to get in shape for that big race you were telling me about. The shock was a severe strain to it."
Tom promised, reluctantly, and, though he did no work, his first act, on reaching home, was to go out to the shop, to inspect the battery and motor. To his surprise the motor was running for the lad had established the connection, in spite of his shock and his father and Mr. Sharp had decided to let the machinery run until he came back.
"And look at the record it's made!" cried Tom delightedly as he glanced at the gauge. "Better than I figured on. That battery is a wonder. I'll have the fastest electric runabout you ever saw."
"If the wires don't get crossed again," put in Mr. Sharp. "You'd better make an examination, Tom," and, for the first time, the young inventor learned how he had been shocked.
"Crossed wires! I should say they were crossed!" he exclaimed as he looked at the switches and copper conductors. "Somebody has been tampering with them. No wonder I was shocked!"
"Who did it?" asked Mr. Sharp.
Tom considered for a moment, before answering. Then he said:
"I believe it was Addison Berg. He must have wanted to do some damage, to get even with us for getting that treasure away from him."
"Berg?" questioned the balloonist, and Tom told of the night he had been tripped into the brook, and exhibited the watch charm he had secured. Mr. Sharp recognized it at once. A further examination confirmed the belief that the submarine agent had sneaked into Tom's workshop, and had altered the wires.
"They were all right when I came out of the shop that night," declared Tom. "I left the old connections just as I thought I had arranged them, and only added the new ones, when I went to try my battery. The old connections were crossed, but I didn't notice it. Then when I turned on the current I got the shock. I don't s'pose Berg thought I'd be so nearly killed. Probably he wanted to burn out my motor, and spoil it. If it was Andy Foger I could understand it, but a man like Berg—"