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For a long time we have known ultra-violet radiations still more rapid, and, on the other hand, infra-red ones more slow, while in the last few years the field of known radiations has been singularly extended in both directions. It is to M. Rubens and his fellow-workers that are due the most brilliant conquests in the matter of great wave-lengths.
"Look!" cried LeCroix, very much elated at the effect that had been produced by his infra-red rays, "There is the sign the vase of flowers. We have got him this time!" LeCroix gleefully patted a peculiar instrument beside him.
Flaming ultra-violet and dully glowing infra-red, the twin beams lashed out; but their utmost force was of slight moment to the enormous power driving the enemy screens. Two circular spots of cherry red in space were the only results of Stevens' attack, and the next fierce cut sheared away the two projectors and, incidentally, a full half of the fifty-inch armor of the leading edge.
He chuckled, and then, after a short pause, went on: "But here's what's important Ku Sui is alive. Yes, I know it. He has an assignation with Tantril at Tantril's ranch. In five days. And the coordinated brains I promised to destroy they still exist. So, Eliot, these are orders: prepare plans for infra-red and ultra-violet devices they ought to do it so we can see Dr.
He watched Carse snap on the automatic control and go to an electelscope which had been equipped with an infra-red device. He directed it rearward on Satellite III, back along the course the Sandra had described, and peered through its eyepiece for several minutes. Then he turned to the old scientist. "Nothing," he said. "No sign of the asteroid as yet. We'll have to keep careful watch.
Apparently it was a combination of powerful electric arcs, the rays of which were shot through a funnel-like arrangement into a converter or, rather, a sort of concentration apparatus from which the dread power could be released through a tube-like affair at one end. It was his infra-red heat wave, F-ray, engine. "I told you it would work!" cried LeCroix.
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."
He gazed through the electelscope, which had been equipped with an infra-red device and trained on the asteroid, and saw that now, where the massive body of rock had been poised, there was nothing. Only the brilliant light of mid-afternoon, the cloudless sky. Carse swept the glass around. The search was fruitless. The heavens were bare. The asteroid had gone.
His main grids were set in the reverse. The infra-red waves, flung from the bow window, were of a frequency which Snap and I believed that Grantline could not pick up. And over against the wall, close beside me and seemingly ignored by Snap, there was a tiny ultra-violet sender. Its faint hum and the quivering of its mirrors had so far passed unnoticed. Would some Earth station pick it up?
To this prismatic distortion was owing the establishment of a pseudo-maximum of heat in the infra-red, which disappeared when the natural arrangement by wave-length was allowed free play. Langley's bolometer has shown that the hottest part of the normal spectrum virtually coincides with its most luminous part, both lying in the orange, close to the D-line.
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