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Updated: May 22, 2025
You know that radium is activated and glows under ultra-violet?" "Yes." "Mounted on our flyer are six ultra-violet searchlights. By the side of each one is a wide angle telescopic concentrator which will focus any reflected ultra-violet onto a radium coated screen and thus make it visible to us.
The stars whose spectrum is known to be banded, to contain bright lines, or to be peculiar in other respects, will also be examined systematically. Experiments will also be tried with orthochromatic plates and the use of a colored absorbing medium, in order to photograph the red portions of the spectra of the bright stars. Quartz will also be tried to extend the images toward the ultra-violet.
"Hold on," Arcot cautioned, "here we go again!" Again he threw the little red tumbler that threw a flood of energy into the coils. The space about them seemed to shiver and grow dim. Arcot had thrown more power into the coils this time, so the stars ahead of them instead of appearing violet were almost invisible; they were radiating in the ultra-violet now.
Thus, by the means of stellar light-analysis, acquaintance was first made with the ultra-violet spectrum of hydrogen; and its harmonic character, as expressed by "Balmer's Law," supplies a sure test for discriminating, among newly discovered lines, those that appertain from those that are unrelated to it.
The result was fully to confirm the origin from carbon-compounds assigned to the visible rays, by disclosing additional bands belonging to the same series in the ultra-violet; as well as to establish unmistakably the presence of a not inconsiderable proportion of reflected solar light by the clear impression of some of the principal Fraunhofer lines.
Kennedy was speaking rapidly and was careful not to pause long enough to give Prescott an opportunity to interrupt him. "These ultra-violet rays," he continued, "are always present in an electric arc light though not to a great degree unless the carbons have metal cores.
The complexion, from being normal, had changed to an ultra-violet tint; the eyes opened wider and wider, and I was anxiously awaiting a catastrophe. It came, but in a very different form from that I had expected. Suddenly and noiselessly the bath was raised, and the steam poured out, laying a soft white curtain over what followed.
Professor Rowland's photographic map of the solar spectrum, published in 1886, and in a second enlarged edition in 1889, opened fresh possibilities for its study, from far down in the red to high up in the ultra-violet, and the accompanying scale of absolute wave-lengths has been, with trifling modifications, universally adopted. His new table of standard solar lines was published in 1893.
They were taken into a space ship behind an ultra-violet absorbing wall and so became invisible." "If the walls absorbed all the ultra-violet and were impermeable to light without ultra-violet, the ship would appear as a black opaque substance and could be seen." "That would be true except for one thing which you are forgetting.
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.
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