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The ideas gathered from the most recent experiments also bring us to the same conclusion. In the ether thus constituted there are therefore propagated transverse vibrations, regarding which all experiments in optics furnish very precise information. The amplitude of these vibrations is exceedingly small, even in relation to the wave-length, small as these last are.
On the other hand, if a 'light' is used whose wave-length is too big to have any influence on the object's condition of movement, it precludes any exact determination of the object's location.
An apparatus called a "transformer" alters the wave-length of an electrical current and reduces high pressure to low pressure, or the reverse. The brain of the artist seems to function in a somewhat similar manner as it reshapes the material furnished it by the senses, and expresses it in new forms.
But when the larger dust particles are wholly or partially burnt, so that only the very smallest fragments remain, a blue light appears, because these are so minute as to reflect chiefly the more refrangible rays, which are of shorter wave-length those at the blue end of the spectrum and which are thus scattered in all directions, while the red and yellow rays pass straight on as before.
Thus stations which desired to communicate could select a certain wave-length, and they could send and receive messages without interfering with others using different wave-lengths, or without the receiving station being confused by messages coming in from other stations using different wave-lengths.
It was at first thought that the index always varied in inverse ratio to the wave-length, but numerous substances have been discovered which present the phenomenon of abnormal dispersion that is to say, substances in which certain radiations are propagated, on the contrary, the more quickly the shorter their period.
A e is then the length of a wave of light, while A d is half a wave-length.
We know from those spectroscopic researches which have thrown so much light on different branches of science, that a molecule can be set into a state of internal vibration, in which it gives off to the surrounding medium light of definite refrangibility light, that is, of definite wave-length and definite period of vibration.
Different wave-lengths, as already explained, correspond to various periods in the pendulous swing of floating bodies. Examples have been cited by Mr. Vaughan Cornish, M. Sc., in Knowledge, 2nd March, 1896, as follows: "A wave-length of fifty feet corresponds to a period of two and a half seconds, while one of 310 feet corresponds to five and a half seconds.
Now it will readily be seen that if all, or even some only, of these intermediates, with all the complications producible by differences of wave-length, are perceptible on the astral plane, our comprehension of nature might be very greatly increased on that level, and we might be able to acquire much information which is now hidden from us.
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