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The ultraviolet manifests through chemical effects, the infra-red through thermal effects. We have left them out of our considerations because these regions of the spectrum differ from the visible part not only quantitatively, as present-day science believes, but qualitatively also, and in a fundamental way.
A gang of men were hard at work erecting a huge parabolic reflector in the center of the circle, about the periphery of which the infra-red reflectors were placed. In an open space near the center stood a Hadley space ship, toward which Jim led the way. I wondered at the activity and meant to ask what it portended, but in the excitement of boarding the flyer forgot it.
The altimeter dials spun backwards to zero and a soft vibration was the only indication they had landed. All of the cabin lights were off except for the fluorescent glow of the instruments. A white-speckled grey filled the infra-red screen, radiation from the still warm sand and stone. There were no moving blips on it, not the characteristic shape of a shielded atomic generator.
Finally, in 1901, he embodied in a splendid map of the infra-red spectrum 740 absorption-lines of determinate wave-lengths, ranging from 0·76 to 5·3 microns. Here, then, he thought, might eventually be found a sure standing-ground for vitally important previsions of famines, droughts, and bonanza-crops.
When they were written the hole which Jim Carpenter had burned with his battery of infra-red lamps through the heaviside layer, that hollow sphere of invisible semi-plastic organic matter which encloses the world as a nutshell does a kernel, was gradually filling in as he had predicted it would: every one thought that in another ten years the world would be safely enclosed again in its protective layer as it had been since the dawn of time.
There are lots of heavy metals in Jupiter somewhere, but we probably couldn't find them. Jupiter's atmosphere is one mass of fog, and we couldn't see, since we haven't got an infra-red transformer. I could build one, in time, but it would take quite a while and we couldn't work on Jupiter, anyway, because of its gravity and probably because of its atmosphere.
Ku's operating equipment from the air-car, he called aside one of his assistants and instructed him to go and survey the asteroid through the infra-red device every ten minutes: and with this order the old scientist dismissed the matter from his mind, and turned all his energies to preparing the laboratory for the operations.
He especially devoted himself to investigations of the radiation of heat from the sun and its absorption by the earth's atmosphere, and to that end devised various delicate methods and instruments, including his electric compensation pyrheliometer, invented in 1893, and apparatus for obtaining a photographic representation of the infra-red spectrum .
The Earth-clock on the wall ticked on; seconds built minutes, and the minutes passed. The asteroid was only ten miles astern. "Eliot," said Carse quietly, "get me one of your infra-red glasses." He took over the controls again. Carefully he varied the forward repulsion and sent current to the side gravity-plates, and slowly the Sandra answered by rotating, longitudinally, reversing her position.
With his infra-red glasses, through the bow windows, Carse could now see the massive body in full detail. There was the dome, a huge, gleaming cup of transparent stuff now showing wisps of blue, from the defensive web around it; and inside were the several buildings, and minute black dots which were the figures of men. There was a great number of them.
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