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Its visible portion covers a range of about one octave; bolometric indications already in 1884 comprised between three and four. The great importance of the newly explored region appears from the fact that three-fourths of the entire energy of sunlight reside in the infra-red, while scarcely more than one-hundredth part of that amount is found in the better known ultra-violet space.
The effects of diffraction gratings were first discussed, and in two which were shown it was found that in some spectra the visible portions were dimmed; in others the ultra-violet and the infra-red were almost entirely absent. It thus became necessary to investigate the condition of a grating before placing any confidence in the results obtained.
Johnny dictated the message of his location which we received. In his incautious excitement he ignored the secret code. An interval passed. No message had come from us just Snap's routine signal in the weak infra-red, which we hoped Grantline would not get. The men crowding Grantline's instrument room waited in tense silence. Then Grantline tried the television again.
Behind it were the buildings: the large, four-winged central structure and the supplementary workshops and hangars, coolie-quarters and outhouses, all dim and shimmering through the infra-red the mysterious, lonely citadel of Dr. Ku Sui. There it all was, inside the dome, with the rest of the asteroid looming massive behind.
Finally it came to rest upon the surface, hundreds of feet deep in a lush, dank, tropical jungle, and Brandon plugged into the Venerian room. "Kenor? We've got a lot of use for you, if you can come down here for a while. Thanks a lot." He turned to the Martians. "Luckily, we've got a couple of infra-red transformers aboard, so we won't have to build one.
General Crowninshield sat beside the physicist at an auxiliary board, phones at ears and four infra-red visiray plates ranged in front of him; ready through light or darkness to direct and oversee the attack, no matter where it might lead or how widely separated the platoons might become before the citadel was taken.
The long waves of the Infra-red and the short waves of the Ultra-violet ends of the spectrum are invisible to your Earth people except in rare cases of developed mediumship, though your photograph plates are somewhat sensitive to these vibrations.
"Why," he said, "I've heard of a certain Viennese, one LeCroix I believe, who has discovered or perfected an infra-red ray instrument which shoots its power a great distance with extreme accuracy and leaves a mark like these." "Is he in New York?" I inquired anxiously. "Yes, I believe he is."
Leithgow smiled gently in answer, then left the cabin for the sleep he needed so badly. Hawk Carse was left alone on watch in the fleeing Sandra. A lonely, intent figure, he stood over the chart-table, working out their best course to Earth. Presently, however, he went back to the infra-red electelscope and swept it over the leagues behind.
He began his experiments on the chemical action of red and infra-red rays in 1874, and at length succeeded in obtaining a substance the "blue" bromide of silver highly sensitive to these slower vibrations of light.
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