Von Holtz stared at him, his weak eyes almost frightened.

“You know? You know how to combine the right angles?”

“I think so,” said Tommy. “I’ve got to find out if I’m right. Will you make the metal?”

Von Holtz bit at his too-red lips.

“But Herr Reames!” he said stridently, “I wish to know the equation! Tell me the method of pointing a body in a fourth or a fifth direction. It is only fair—”

“Denham didn’t tell you,” said Tommy.

Von Holtz’s arms jerked wildly.

“But I will not make the metal! I insist upon being told the equation! I insist upon it! I will not make the metal if you do not tell me!”

Smithers was in the laboratory, of course. He had been surveying the big solenoid-catapult and scratching his chin reflectively. Now he turned.