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Updated: May 10, 2025
He has simply made use of a principle known for some time, but as there was no need for it, it hasn't been used. It was found back in the early days of radio, as early as the first quarter of the twentieth century, that very short wavelengths effected peculiar changes in metals. It was shown that the plates of tubes working on very short waves became nearly transparent.
"With us the question of hearing is merely the question of wavelengths in the air," he replied; "the lowest audible sound having a wavelength of sixteen feet, the highest less than an inch. Some people can't hear the squeak of a bat, others the rumble of an earthquake. I merely affirm that in every form sleeps the creative sound that is its life and being.
I must assume that my readers are familiar with the receiving apparatus of wireless telegraphy, which must be "tuned" by the operator until its own vibratory quality is in exact harmony with the vibrations the extremely rapid impacts of those short electric wavelengths we call Hertzian, and which carry the wireless messages.
Starting from the single assumption of transverse undulations, we first of all determine the wave-lengths, and find that on them all the phenomena of colour are dependent. The wavelengths may be determined in many independent ways. Newton virtually determined them when he measured the periods of his Fits: the length of a fit, in fact, is that of a quarter of an undulation.
In both cases the undulations are shortened when they enter the gypsum, but in the one case they are more shortened than in the other. You can readily imagine that in this way the one system of waves may get half a wave-length, or indeed any number of half wavelengths, in advance of the other. The possibility of interference here at once flashes upon the mind.
"They use electricity as a minor kind of defense," Nance went on, her tone still low with suppressed excitement that was close to dread. "We know that some of them can give you a shock if you're fool enough to get so close that you can touch them. And they do emit radio impulses on certain wavelengths. Signals communication...? As for the rest, perhaps you'd better do your own guessing, Frank.
They used the "useless" wavelengths around 100 metres. INTERNATIONAL DX had come to stay. As no licences were issued for many years there are no official records to be consulted. Early activity was mainly in and around Athens but there may have been one or two stations in other parts of the country which we never heard in the capital.
Most commercial experimental transmissions in wireless telegraphy before World War I were carried out on the "long" wavelengths, though they were not called that at the time. In the U.S.A. amateurs were permitted to use a D.C.input of 1,000 watts to the anode of the final stage of their transmitters.
According to M. Blondlot the N rays can be polarised, refracted, and dispersed, while they have wavelengths comprised within .0030 micron, and .0760 micron that is to say, between an eighth and a fifth of that found for the extreme ultra-violet rays. They might be, perhaps, simply rays of a very short period.
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