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The Vacuum Tube Oscillator. As explained before you can use any amplifying tube that is made for a plate potential of 100 volts. The current required for heating the filament is about 1 ampere at 6 volts. A porcelain socket should be used for this tube as it is the best insulating material for the purpose. An amplifier tube of this type is shown at H and costs $6.50. The Storage Battery.
When frequencies such as are obtained by mechanical means are used, I think that the rupture of the glass is more or less the consequence of the bombardment, which warms it up and impairs its insulating power; but with frequencies obtainable with condensers I have no doubt that the glass may give way without previous heating.
Fibrous cables, so called from the conductors being covered with some fibrous material, as cotton or paper, which is saturated with the insulating material, paraffine, resin oil, or some special compound. Under this latter head is also included the dry core paper cables.
I think, however, that in the case of an electrode immersed in a fluid insulating medium, and surrounded by independent carriers of electric charges, which can be acted upon inductively, a sufficiently high frequency of the impulses would probably result in a gravitation of the gas all around toward the electrode.
The following experiment illustrates notably the movement of the electric waves through free space: "December 26, 1875. Etheric Force. An experiment tried to-night gives a curious result. A is a vibrator, B, C, D, E are sheets of tin-foil hung on insulating stands. The sheets are about twelve by eight inches.
After the ceremonial greetings had been paid, Lady Eleanore Rochcliffe stood apart from the mob of guests, insulating herself within a small and distinguished circle to whom she accorded a more cordial favor than to the general throng.
It would therefore be just, without going further back than Faraday, to say how that illustrious physicist drew attention to the part taken by insulating media in electrical phenomena, and to insist also on the admirable memoirs in which for the first time Clerk Maxwell made a solid bridge between those two great chapters of Physics, optics and electricity, which till then had been independent of each other.
With new systems of ventilation there is an insulating jacket which equalizes the temperature of the room by heating the fresh air and distributing it evenly. It is strange how slowly people change their habits and even their opinions.
He was prepared to believe in some exceptional, perhaps anomalous, form of exaggerated sensibility, relating to what class of objects he could not at present conjecture, but which was as vital to the subject of it as the insulating arrangement to a piece of electrical machinery.
Davy had to stay at home to train Peaches in many fancy tricks and to keep a path open to the Gillis home. Welborn, however, took no part in these activities. He continued his work at the ravine and expressed joy that a heavy snow would prevent a deep freeze of the gravel. In fact, much of his time was consumed in insulating the pumps, the waterpipes and the area where he was to work.
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