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Professor Schumann has succeeded in photographing them by depositing bromide of silver directly on glass plates without fixing it with gelatine; and he has, by the same process, photographed in the spectrum of hydrogen a ray with a wave-length of only 0.1 micron.
It would make his labours seem like a failure and would discourage others from keeping up the experiments. They had planned to steal a march on the world. Every time the Z99 was out they worked up here with their improvised wireless until they found the wave-length Shirley was using.
Of these, four were the known visible lines, and a fifth, high up in the ultra-violet, at wave-length 3,727, has evidently peculiar relationships, as yet imperfectly apprehended. It is strong in the spectra of many planetaries; it helped to characterise the nebular metamorphosis of Nova Aurigæ, yet failed to appear in Nova Persei.
"Go to it!" The captain waved his hand and the operative bent to his task. "Commanders of all vessels of the Fleet!" The Headquarters speaker, receiver sealed upon the wave-length of the Admiral of the Fleet, broke the long silence. "All vessels, in sectors L to R, inclusive, will interlock location signals.
Professor Langley now got heating effects from rays of above twice that wave-length, his delicate thread of platinum groping its way down nearly to thirty ten-thousandths of a millimetre, or three "microns." The known extent of the solar spectrum was thus at once more than doubled.
There was a big combination view and communication screen, and I hurried to that and called the Times. Dad came on, as soon as I finished punching the wave-length combination. He was in his shirt sleeves, and he was wearing a gun. I guess we made kind of a show of ourselves, but, after all, he'd come within an ace of being all out of family, and I'd come within an ace of being all out, period.
The girl Mal seemed to understand and went to tell the others. Captain Moggs came upon Soames, feverishly making up bundles of objects the children had brought out of their ship before Fran in the brown tunic had burned it. Captain Moggs said approvingly: "You must have anticipated my orders! But I thought it unwise to tell you by radio on the inter-base wave-length."
To this prismatic distortion was owing the establishment of a pseudo-maximum of heat in the infra-red, which disappeared when the natural arrangement by wave-length was allowed free play. Langley's bolometer has shown that the hottest part of the normal spectrum virtually coincides with its most luminous part, both lying in the orange, close to the D-line.
If a stone could be thrown in interstellar space with a velocity of fifty feet a second it would continue to move in a straight line with the same speed for any assignable time. As has been said, light moves with the velocity of 186,000 miles per second, and it may pursue its course for tens of thousands of years. There is no evidence that it ever loses either its wave-length or energy.
This problem had been solved by one of the largest mirror surfaces that man had ever created flat to a quarter of a wave-length of light, and two hundred fifty feet in diameter, the beam director, from this distance looking as though it were a carelessly tossed looking-glass from milady's handbag, anchored one diameter forward of the big power balloon.
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