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He saw the Chief rise very cautiously, holding on to the arms of his seat. "Better not look at the sun," said Joe, "even though I've put on the glare-shields." The Chief nodded. The glare-shields would keep out most of the heat and a very great deal of the ultraviolet the sun gave off.
As they sat down, he aimed his ultraviolet light-pencil at a serving robot. Unlike Mardukan robots, which looked like surrealist conceptions of Pre-Atomic armored knights, it was a smooth ovoid floating a few inches from the floor on its own contragravity; as it approached, its top opened like a bursting beetle shell and hinged trays of food swung out. The boy looked at it in fascination.
It is possible that the creature out on deck generates the invisible light, and can see by it. "'But what does it all amount to? I asked impatiently. "'I haf told you, he answered calmly. 'Der creature may live in an atmosphere of ultraviolet light, which I can generate mineself. When mine plates dry, und it clears off so I can see what I am doing, I may get a picture of it.
"One for our Philippine squadron, one for the Hawaiian, and one for the coast. You overdid things, Saiksi. If you hadn't set fire to that sealer the other day, I might not have found you. It was a senseless piece of work that did you no good. Oh, you are a sweet character! How do you get your ultraviolet rays by filtration or prismatic dispersion?" "By filtration."
There are substances, however, on which the violet and ultra-violet waves exert a special decomposing power; and, by permitting the invisible spectrum to fall upon surfaces prepared with such substances, we reveal both the existence and the extent of the ultraviolet spectrum. Ultra-violet Rays: Fluorescence.
"Good heavens!" shouted Edmund. "It is the ultraviolet rays! They have gone mad!" In the meantime the gigantic high priest whirled upon his heel, swinging his arms abroad and uttering a kind of chant which was audible above the dreadful clamor of the rabid multitude. Though he had no weapon, he seemed the inspirer of this Aceldama, and around him its fury raged.
The method of exhibiting the action of the ultraviolet rays by their chemical action has been long known; indeed, Thomas Young photographed the ultra-violet rings of Newton. We have now to demonstrate their presence in another way.
Taking advantage of all the shade he could, since Homeworld's sun put out more ultraviolet than Terra's, he cut sticks for a leanto framework, then climbed up the soh tree and began one-handedly hacking off the tough-stemmed leaves. It was hard work, but it shouldn't take more than a couple dozen of the big leaves to make a decent shelter.
He showed us the inoculation and culture room for tissue culture as well as the ultraviolet tube where the mother spawn is prepared. Rushing up and down the lab and the lecture hall we were shown how straw is boiled, how the mushroom bags are filled, and so on. We were allowed to actively participate and fill in the bags ourselves.
It may be some other form of solar radiation to which we are not accustomed on the earth, but which is specially effective here when the sun is uncovered because of the greater nearness of Venus. This atmosphere, notwithstanding its density, may well be diaphanous to the ultraviolet rays, owing to some peculiarity in its composition which I have not had time to study.
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