Bill Bonwitt, the young chief engineer at the mercury mines that bored into the surface of Earth's moon at the crater Tycho, knew something was wrong. His hob-nailed boots beat a swift tattoo on the metal steps as he quick-footed down to the radio room.

"Crane!" he yelled to the operator. "Have you felt it?"

His friend grinned up from the ethertype machine. There came a quivering of the floor, then a prolonged but diminishing vibration. "I felt it, sure. That was the transport, blasting away from Tycho, is all. What's wrong with you—jitters?"

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