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Luis Gofredo saw to it that the camp itself would be visible-lighted, and beyond the lights he set up more photoelectric robot sentries and put a couple of snoopers to circling on contragravity, with infra-red lights and receptors. He also insisted that all his own men and all Dave Questell's Navy construction engineers keep their weapons ready to hand.
Carse gave the controls to Ban and examined it carefully through the electelscope, after removing the infra-red attachment. He saw that the keel of the Sandra had torn a great, mangled rent in the dome and through this the air had rushed out. Space had taken possession.
The sub-ray lights!" The search-beams from our towers were inordinately active. Sweeping the empty snow-plain and the empty sky. Empty? To my fevered imagination they were peopled with enemies. And then one of the towers flashed on a sub-ray the dull infra-red for envisaging the slow rays below the power of human sight. And another tower with its faint purple beam was using the ultra-violet.
This was the first pitfall into which an experimentalist was liable to fall. If prisms were used for obtaining the spectrum, then precautions had also to be taken, since all glass absorbed a portion of the ultra-violet rays and some the infra-red. On the whole, he considered that the best glass to use was pure white flint glass for the collimator, the prisms, and the camera lens.
The singular fact was, however, elicited that this almost evanescent spectrum is made up of two superposed spectra, one due to reflection, the other, with a maximum far down in the infra-red, to radiation. The corresponding temperature of the moon's sunlit surface Professor Langley considers to be about that of freezing water.
"Now as we increase the rapidity of wave vibration and decrease the wave length we pass from sound waves to heat waves or what are known as the infra-red waves, those which lie below the red in the spectrum of light. Next we come to light, which is composed of the seven colours as you know from seeing them resolved in a prism.
With this simple hypothesis we can fairly well interpret the phenomena of the dispersion of light in the case of transparent substances; but far from well, as M. Carvallo has noted in some extremely careful experiments, the dispersion of the infra-red spectrum, and not at all the peculiarities presented by absorbent substances.
"I got one slight television swing a minute ago then it faded. I think it's the Planetara." "Planetara!" The crowding group of men chorused. How could it be the Planetara? But it was. The call came in presently. Unmistakably the Planetara, turned back now from her course to Ferrok-Shahn. "How far away, Peter?" The duty man consulted the needles of his dial scale. "Close! Very weak infra-red.
"Don't say anything of importance," he spelled out. "They have mikes in here to pick up all we say. Probably infra-red telenses too, so they can see what we do." So Sime told him, as they huddled together in simulated sleep, about the walled passages, and they speculated on the possibility of felling the guards and breaking their way to freedom through some underground cavern.
I could have been invisible to Thett's ships as we followed them here, and for the greater part of the way I was, for I was sufficiently out of their time-rate, so that they were visible only by the short ultra-violet, which would have put in their infra-red, and, no photo-electric cell will work on quanta of such low energy.
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