"The skull is not injured," he announced. "It is merely a scalp wound. Wait a moment now and I will give you something to make you feel better."
From a small pocket case he took a spoon and a bottle. He poured out a strong–smelling liquid, and administered a few drops to the German. The latter's pale face at once became flushed.
"I think you will be all right now," said Mr. Henderson. "But it was a narrow escape. Do you feel well enough to let us take you to the house?"
"I think so. But guard the shop well. That crazy machinist came back, and some one was with him. Then came an explosion—and I don't remember any more."
"I'll guard the place!" exclaimed Andy. "And if any of those chaps come around—well, they'll wish they hadn't," and he looked significantly at his gun.
Mr. Roumann was getting better every moment, and was soon able to stand. He was assisted to the house, where Mr. Henderson attended to the injury on his head.
Then, after some more medicine had been administered, and the electric remedy had been applied again, the German announced that he felt almost as good as ever, except for an aching head.
"How did it all happen?" asked Mr. Henderson, and Jack and Mark told what they knew of the explosion.
"I was working over an extra air–pump that I wish to take along with us," stated Mr. Roumann, "when I was startled by seeing two strangers standing near my work bench. One I recognized as the insane machinist who was here before. The other—"
"The other was the same one who looked in the window one night, and who, I believe, stole the power plates," interrupted Jack.