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He followed to the small, far-spaced hut now snow-buried to its eaves in which the seismograph ticked away to itself. "I think I'm going crazy," said the geophysics man. "Did you ever hear of a ground-shock starting inside out?" He pointed to the graph-paper that fed very, very slowly past the seismograph's pens. The recording did look odd.
"It's a concussion-wave," said Soames soberly. "It arrived four hundred odd seconds after the static. Eighty miles.... A noise has to be pretty loud to travel so far! A ground-shock has to be rather sharp to be felt as an earth-tremor at eighty miles.
We'll find ourselves quite accidentally where the radar said there was the great-grandfather of static bursts, with a ground-shock and a concussion-wave to boot. We may even be blown farther, to where something dived downward for four or five miles and vanished below the horizon." Captain Moggs said uneasily: "Most irregular. But it might be wise." "Of course," said Soames.
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