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We can't have superconductors above 18° Kelvin, which is colder than liquid hydrogen. But a superconductor acts like a magnetic shield, no, not exactly. But you can't touch a magnet to one. Induced currents in the superconductor fight its approach. I'd like to know what happens to the magnetic field. Does it cancel, or bounce, or what? Could it, for instance, be focussed?" "I don't see ..."
It was due to a few dauntless men of science, conspicuous among whom were Lord Kelvin, the great English savant; Herr Roentgen, the discover of the famous X-ray, and especially Thomas A. Edison, the American genius of science.
'Oh because I could not leave just now, she said slowly, quite conscious of a change in his voice and look. 'But you will go, I suppose, after? 'I suppose so. They seem to wish it very much. 'And you want to go, of course. They are very grand West End swells. I know their house a big mansion looking over the Kelvin, he said, not bitterly, but in the same even, indifferent voice.
"But where is the gold?" cried one. "Covered up, of course," said Lord Kelvin. "Buried in Stardust. This asteroid could not have continued to travel for millions of years through legions of space strewn with meteoric particles without becoming covered with the inevitable dust and grime of such a journey. We must dig now, and then doubtless we shall find the metal."
There was nothing surprising in what had occurred to them the moment one considered the laws of gravitation on the asteroid, but their stories aroused an intense interest among all who listened to them. Lord Kelvin was particularly interested, and while Mr.
Yet the most competent of living authorities, Lord Kelvin, could assert in 1895 that in fifty years he had learned nothing new regarding the nature of energy. This, however, must not be interpreted as meaning that the world has stood still during these two generations. It means rather that the rank and file have been moving forward along the road the leaders had already travelled.
It is well also to keep on record the striking dictum of Lord Kelvin, addressed to the students of University College. "Science," he told them, "positively affirmed creative power." It will be remembered that we quoted Mill as speaking of "permanent causes." We may be grateful to him for the suggestion.
He began to work his way out of his own vacuum-suit. "Item," he said. "The ships are fuelled and provisioned. A practical tribe, the Wealdians! The ships are ready to take off as soon as they're warmed up inside. A half-degree sun doesn't radiate heat enough to keep a ship warm, when the rest of the cosmos is effectively near zero Kelvin. Here, point the heaters like this."
He thinks they are the missing "longitudinal" rays of light whose existence has been conjectured by Lord Kelvin and others that is to say, waves in which the ether sways to and fro along the direction of the ray, as in the case of sound vibrations, and not from side to side across it as in ordinary light. Be this as it may, his discovery has opened up a new field of research and invention.
Indeed, Lord Kelvin, speaking at Clerkenwell on February 26th, 1904, is reported in The Times to have said, referring to the extraordinary progress of scientific research, that it "had, perhaps, been even more remarkable and striking at the beginning of the twentieth century than during the whole of the nineteenth."
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