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Updated: May 15, 2025
Two other drivers tipped off our men. We left those trucks and some others out on the field, so the drivers wouldn't be suspected of alerting us." "Good work," said Bors. "Better put detectors on all parcels from all trucks before bringing them aboard."
"Well, to tell the truth, it isn't quite as simple as that," confessed Harvey. "There's a whole lot to learn about receiving and transmitting and detectors and generators and condensers and vacuum tubes and all that.
Dave Slocum sold more feet of copper wire in that one afternoon than he had in the previous five years, not to mention insulators, resistance wire, detectors, head sets, and all the other paraphernalia necessary to the beginner. At last all the various purchases were tied into neat bundles, and the excited boys swarmed out into the street.
Lyad glanced at the outline in the detectors. "It is!" Her face went white. "Talk to 'em," he ordered. "Know their call number?" "Of course," Lyad sat down at the communicator. Her hands shook for a moment, then steadied. "What am I to say?" "Just find out what's happened, to start with. Why they're still here. Then we'll improvise. Get them to come to the screen if you can."
In many systems in use, and in the new one of Marconi himself, the use of these tubes has been abandoned and replaced by magnetic detectors.
There are many other important active sensor classes, three of which are active acoustics, lidar and magnetic anomaly detectors. The practical application of lidar is a relatively recent development enabled by advances in laser, power management, and data processing technologies. Lidar detects shape directly and shape fluctuations such as vibration and motion and has proven very hard to spoof.
She'd seen recordings of those swift, clever, constitutionally murderous creatures in action. "You say it looked like catassin killings. They haven't found it?" "No. But they think they got rid of it. Emptied the air from most of the ship after they surfaced and combed over the rest of it with life detectors.
Every space-ship within range of her powerful detectors was represented by two brilliant, slowly moving points of light; one upon a great micrometer screen, the other in the "tank" the immense, three-dimensional, minutely cubed model of the entire Solar System. A brilliantly intense red light flared upon a panel and a bell clanged brazenly the furious signals of the sector alarm.
Like MacLeod, they wore only the plastic disks they had received in exchange for the metal ones they wore inside the reservation, and they were being searched by attendants who combed through their hair, probed into ears and nostrils, peered into mouths with tiny searchlights, and employed a variety of magnetic and electronic detectors. To this search MacLeod submitted wearily.
His hands trembled so that he could not hold the switch steady, and the lamp blinked on and off. On the storm-swept, night-hidden hillside which overhung the field was established an anti-aircraft battery. The sound detectors had just registered the intermittent hum of an enemy plane.
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