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Updated: June 14, 2025
The explanation of these phenomena is that the number of dust particles in ordinary air is so great that they reflect abundance of light of all wave-lengths, and thus cause the interior of the vessel containing them to appear illuminated with white light.
Liberty is no mere conclusion of linked logic long-drawn out: it is an axiom, a flaming avatar. The arguments by which it is defended are important, but they bear to it much the same relation that a table of the wave-lengths of various rays of light bears to the immediate glory of a sunrise. There is another obstacle.
Carefully, slowly, he "tuned up" the wave-lengths; up, up to five thousand metres, then back again; he ran the whole gamut of the wireless scale. Out, ever out into the thickening gloom, across the void and vacancy of the dead world, he flung his lightnings in a wild appeal. His face grew hard and eager. "Anything? Any answer?" asked Beatrice, laying a hand upon his shoulder a hand that trembled.
This ensures that they can be observed clearly by the human eye. Much smaller objects, however, will require a correspondingly shorter wave-length in the medium of observation. Now shorter wave-lengths than those of visible light have been found in ultra-violet light and in X-rays; and these, accordingly, are now often used for minute physical research.
But in the present state of things, since the legal and customary definition of the unit remains a material standard, it is not enough to measure length in terms of wave-lengths, and we must also know the value of these wave-lengths in terms of the standard prototype of the metre. This was determined in 1894 by M. Michelson and M. Benoit in an experiment which will remain classic.
Very, very carefully, he monitored all the wave-lengths and wave-forms he could discover in use on Weald. There was no mention of the oddity of behavior of shiploads of surplus grain aloft. There was no mention of the ships at all.
We are at present more inclined to produce these soft characters than to develop paragons. But such movements go in waves and the wave-lengths are growing shorter; we seem now to be reaching the end of a period when, as it has been expressed, "the teacher learns the lessons and says them to the child."
And when the length determined by these independent methods are compared together, the strictest agreement is found to exist between them. With the wave-lengths once at our disposal, we follow the ether into the most complicated cases of interaction between it and ordinary matter, 'the theory is equal to them all.
Supposing a certain thickness of the gypsum produces a retardation of half a wave-length, twice this thickness will produce a retardation of two half wave-lengths, three times this thickness a retardation of three half wave-lengths, and so on.
There'd been an outburst of static of an unprecedented kind. It had covered the globe on all wave-lengths, everywhere of absolute maximum volume. It had used millions of times as much power as any signal ever heard before. No atom bomb could have made it. Science and governments, together, raised three very urgent questions. Who did it? How did they do it? And, why did they do it?
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