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Dunark's machine couldn't work against resistance if the subject wasn't willing to give up his thoughts he couldn't get them. This one can take them away by force. In fact, by increasing plate and grid voltages in the amplifier, I can pretty nearly burn out a man's brain.
When the waves set up oscillations in the primary of the tuning coil the energy of them produces like oscillations in the closed circuit which includes the secondary coil and the condenser; the alternating positive and negative voltages of these are impressed on the grid and these, as we have seen before, cause similar variations of the direct current from the B battery which acts on the plate and which flows between the latter and the filament.
And beyond again were the listening posts and the wire entanglements. How could a girl ever get through the jungle of barbed wire? And in places the Huns had strung live wires, carrying voltages strong enough to kill a man, just as they did along the borderland of Holland. When Ruth thought of these things she lost hope. But she tried not to think at all.
The way the positive and negative voltages of the oscillations which are set up by the incoming waves, energize the grid; how the oscillator tube clips off the negative parts of them, and, finally, how these carry the battery current through the tube are shown graphically by the curves at D. How the Vacuum Tube Acts as an Amplifier.
Yesterday, I was playing with it, transferring a section of my own brain to a magnetized tape for a permanent record, you know and found out that above certain rather low voltages it becomes a form of torture that would make the best efforts of the old Inquisition seem like a petting party." "Did you succeed in the transfer?" Crane was intensely interested. "Sure.
The gas filled tube, however, can be used as an amplifier and either kind of tube can be used for either radio frequency or audio frequency amplification, though with the exhausted tube it is easier to obtain the right plate and filament voltages for good working. The Fixed Resistance Unit, or Grid Leak. Grid leaks are made in different ways but all of them have an enormously high resistance.
When we saw the boys off to Centauri I had a dizzy spell and only with the greatest effort hid my distress until the long train of ships had risen out of sight. Then I lay down in the Visitors Lounge from where I could not be moved for several hours. Great waves of pain flashed up and down my spine as if massive voltages were being released within me.
The way the positive and negative voltages of the oscillations which are set up by the incoming waves, energize the grid; how the oscillator tube clips off the negative parts of them, and, finally, how these carry the battery current through the tube are shown graphically by the curves at D. How the Vacuum Tube Acts as an Amplifier.
In other words, a very slight drop in voltage means a disproportionately great loss in illumination. It might be suggested as a solution of this problem that lamps of different voltages could be used.
In America, where electricity is adopted as the official means of destroying criminals, 1,500 volts is regarded as the lethal dose, but there are many instances of persons having been exposed to higher voltages without bad effects. The alternating current is supposed to be more fatal than the continuous.
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