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They've given us light, both ultra-violet and visible, sound, infra-sound, and electricity I don't know what's left unless they give us a new kind of X-rays, or Hertzian, or infra-red heat waves, or...." "That's it, heat!" exclaimed Seaton. "They produce heat by means of powerful wave-generators and by setting up heavy induced currents in the armor. They can melt arenak that way."
Ultra-violet, infra-red, pure heat, infra-sound, solid beams of high-tension high-frequency current in whose paths the most stubborn metals would be volatilized instantly; all iron-driven, every deadly and torturing vibration known was hurled against that screen; but it, too, was iron-driven, and it held.
So sudden and terrible was the effect that Seaton uttered an involuntary yelp of surprise and pain as he once more fled into the safety of space. "What the devil was that?" demanded DuQuesne. "Was it infra-sound? I didn't suppose such waves could be produced." "Infra-sound is right.
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