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Updated: June 14, 2025
It has become the custom to characterise each vibration by the path which the vibratory movement traverses during the space of a vibration by the length of wave, in a word rather than by the duration of the vibration itself. To measure wave-lengths, the methods must be employed to which I have already alluded on the subject of measurements of length.
Glancing round the cabin, he caught sight of Throppy's wireless outfit; soon the two were engaged in an interested discussion on wave-lengths and the effect of atmospheric disturbances. Later he was talking over the lobster law with Jim, and life-insurance with Lane. He seemed to be equally at home on all subjects. Eight o'clock came before they realized it.
The reason of this spreading-out or "dispersion" is that the various colours have different wave-lengths, and consequently meet with different degrees of retardation in traversing the denser medium of the prism.
The defenses are, however, purely Osnomian in character and material. As we haven't got the stuff to set them up as the Osnomians do, we'll have to do it our own way. We may be able to dope out the next one, though. Let's see, what have they given us so far?" "We've got to hand it to them," responded DuQuesne, admiringly. "They're giving us the whole range of wave-lengths, one at a time.
May it not be then, that by the same law, vibrations of other wave-lengths, yet unknown to science, will be set in motion by the unspoken word of our thought?
Professor Rowland's photographic map of the solar spectrum, published in 1886, and in a second enlarged edition in 1889, opened fresh possibilities for its study, from far down in the red to high up in the ultra-violet, and the accompanying scale of absolute wave-lengths has been, with trifling modifications, universally adopted. His new table of standard solar lines was published in 1893.
On the other hand, a comparison of the present case with those previously mentioned, fails to throw any light on the important question whether the deceased feels any consciousness of the action which the percipient sees, or whether what is seen is like a sort of photograph impressed upon the atmosphere of a particular locality, and visible only to certain persons, who are able to sense etheric wave-lengths which are outside the range of the single octave forming the solar spectrum.
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