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The Thessian replied with all beams he had available, including an induction-beam, an intensely brilliant light-beam, and several molecular cannons with shells loaded with an explosive that was very evidently condensed light. This was no exploration ship, but a full-fledged battleship. The Ancient Mariner was blinded instantly.
A many-windowed room, with a small metal balcony surrounding it outside. Immediately above the room, at the very peak of the tower, was a single, powerful light-beam; its silver searching ray swept the cloudless, starry sky in a slow circle. The room was crowded with instruments. Unlighted, save by the reflected glow of its many image-mirrors, all of which seemed in full operation.
I turned about S.E., very slowly moving for anywhere hereabouts hundreds upon hundreds of craft lay dead within a ten-mile circle of sea and by two in the fore-day had wandered up well in sight of the French cliffs: for I had said: 'I will go and see the light-beam of the great revolving-drum on Calais pier that nightly beams half-way over-sea to England. And the moon shone clear in the southern heaven that morning, like a great old dying queen whose Court swarms distantly from around her, diffident, pale, and tremulous, the paler the nearer; and I could see the mountain-shadows on her spotty full-face, and her misty aureole, and her lights on the sea, as it were kisses stolen in the kingdom of sleep; and all among the quiet ships mysterious white trails and powderings of light, like palace-corridors in some fairy-land forlorn, full of breathless wan whispers, scandals, and runnings-to-and-fro, with leers, and agitated last embraces, and flight of the princess, and death-bed of the king; and on the N.E. horizon a bank of brown cloud that seemed to have no relation with the world; and yonder, not far, the white coast-cliffs, not so low as at Calais near, but arranged in masses separated by vales of sward, each with its wreck: but no light of any revolving-drum I saw.
We note again that both processes occupy a considerable part of the space originally outside the boundaries of the light-area that is, at the violet end the part towards which the light-beam is deflected, and at the red end the part from which it turns away.
In order to realize what happens to the light in passing through the prism, let us remember that it is a characteristic of an ordinary light-beam to direct itself through space in a straight line if not interfered with, and to illuminate equally any cross-section of the area it fills.
The Master spoke a few quick words of Arabic to his orderly. Rrisa knelt by the prostrate man. Then, while the Master kept the light-beam on him, Rrisa unbuckled the guard's belt, with cartridges and holster containing an ugly snouted gun. This belt the Arab slung round his own body. He arose. In silence, leaving the unconscious man just as he had fallen, they once more pushed onward.
Two observations stand before us representing empirically established facts: one, that in so far as a finite velocity has been measured or calculated from other observations, nothing is known about the existence or magnitude of such a velocity except within the boundaries of the dynamic realm constituted by the earth's presence in the universe; the other, that this velocity is a 'group'-velocity, that is, the velocity of the front of a light-beam in process of establishment.
Along the walls were the switchboards, dozens of them, all sizes, all types of instruments, strange to the eyes of the terrestrians, and in practically all the light-beam indicator system was used, no metallic pointers, but tiny mirrors directing a very fine line of brilliant light acted as a needle. The system thus had practically no inertia.
As he entered he beheld a mighty beam of light which sprang from the ground, shattering itself against the roof in countless sparks, falling and flowing all together into a great pool in the rock. Brighter was the light-beam than molten gold, but silent in its rise, and silent in its fall. The sacred stillness of a shrine, a never-broken hush of joy and wonder, filled the cavern.
Stern took no thought of it, but pressed forward, shouting the girl's name, hallooing, beating down the undergrowth with mad fury. And here, there, all about he flung the light-beam. Perhaps she might yet hear his hails; perhaps she might even catch some distant glimmer of his light, and know that help was coming, that rescuers were fighting onward to her.
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