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Updated: May 25, 2025
Arthur Benton was a well-meaning and very straight-dealing public servant with a splendid record as a detector of crime, but against money and such influence he could not cope. Indeed, more than once Rayne declared to me that he intended evil against Benton. "Yet I rather like him," he had said when we were discussing him one day. "After all, he's a real good sportsman!"
"They exist, all right, and I can detect 'em. Look here," and he pointed to a tiny receiver, upon which a small lamp flared in brilliant scarlet light. "Are they sending them?" "No, fortunately. They're coming from our bar. See, it shines blue when I put a grounded shield between it and the bar, and stays blue when I attach it to their detector ray." "Can you direct them?"
Now connect one end of the secondary coil, or rotor, of the variocoupler with one post of the .0005 mfd. variable condenser and the other part to the grid of the detector tube. Connect the other end of the rotor of the variocoupler to one of the posts of the first variometer and the other post of this to one of the terminals of the detector filament.
One is derived from the very character of the acknowledgments which she made, and the period when they were first disclosed. "A death-bed," says the Poet, "is a detector of the heart."
After a few minutes we heard from our magnetic detector the faint sound of the S signals, and then we broke into a great cheer.
Mr Armstrong's gratitude was beyond words. He had set his heart, for the sake of the children of his late colleague, and even for Roger's sake, on covering with a cloak of oblivion the crime of which chance had made him the detector. This American had it in his power to aid or thwart him, and had chosen the former course; and a great weight was lifted off the tutor's mind in consequence.
"I'll show you another thing about this radio detective of mine," went on Arnold energetically. "It's not only a wave length measurer, but by a process of my own I can determine approximately the distance between the sending and the receiving points of a message." He attached another, smaller machine to the wireless detector.
While a vacuum tube detector has an amplifying action of its own, and this accounts for its great sensitiveness, its amplifying action can be further increased to an enormous extent by making the radio frequency currents that are set up in the oscillation circuits react on the detector.
You folks can see just as well, even on the direct-vision wall plates, with light heterodyned on the fifth, so we'll close all ether bands, absolutely. All we'll have to leave open will be the one extremely narrow band upon which our projector is operating, and I'll protect that with a detector screen.
"Fix me up a detector and follow up one of those beams. Find its frequency and direction, first, you know, then pick it up outside and follow it to where it's going. It'll go through anything, of course, but I can trap off enough of it to follow it, even if it's tight enough to choke itself," said Seaton. "That's one thing I got from that brain record."
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