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Updated: May 25, 2025
It is so constructed that it can also be used as a sound detector. Some submarines, besides being equipped with torpedo tubes, carry other tubes for laying mines. In most instances this is only a secondary function of the submarine. There are, however, special mine-laying submarines.
His experience, aided by a heaven-born genius tending in that direction, rendered him the most merciless detector of sophisticated books. Nothing, it might be supposed on first thought, can be a simpler or more easily recognised thing than a book genuine as printed.
When the vacuum tube is used as a detector, the wire filament is heated red-hot and the metal plate is charged with positive electricity though it remains cold.
Tuning in the aërial apparatus was effected by means of a small knob projecting through a slit in the metal box enclosing the delicate instruments including the detector. By working this knob the tuning block was moved up and down the coil till a proper "pitch" was obtained.
Connect the binding post end of the primary coil with one post of the variable condenser, connect the other post of this with one of the posts of the .00025 mfd. condenser and the other end of this with the grid of the detector tube; then around this condenser shunt the grid leak resistance. Simple Regenerative Receiving Set.
He showed the boys how they might get even clearer and louder tones than any they had yet obtained by adjusting the detector until the best possible contact was obtained with the crystal. "You could hear better with a more elaborate set, of course," he said, "but you get mighty good results with what you've got.
Then he looked at the distance recorded on the meteor detector. "There's only one thing to do," Arcot said tightly. "We can never hope to avoid that thing; we haven't got the power. I'm going to try for an orbit around it. We'll fall toward it and give the ship all the acceleration she'll take. There's no time to calculate I'll just pile on the speed until we don't fall into it."
They fed the whole thing to that idiot boy hypnotically, in advance, and then, on a signal, he began typing out this spurious communication. And then, of course, Dallona and this Assassin of hers ran off somewhere together, so that we'd be blamed with discarnating or abducting them, and so that they wouldn't be made to testify about the communication on a lie detector."
"I know exactly how and why such a detector works. We gave 'em an alarm, all right. Even though we were working on a tight beam from here to there, our secondary projector there was radiating enough to affect every such detector within a thousand miles."
Marconi and several others have from time to time invented many other kinds of detectors for the electrical waves. Nearly all have to serve the same purpose, viz., to close a local battery circuit when the electric waves fall upon the detector. There are other inventions on which the action is the reverse. These are called anti-coherers.
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