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"I wish we had some idea where the rest of those bombs are stored, sir," Lieutenant Morrison said. "We don't seem to have gotten anything significant when we flew reconnaissance with the radiation detectors." "No; about all that was picked up was the main power-plant, and the radiation-escape from there was normal," Pickering agreed.

"All x now, I guess don't believe they can see the flash from here. Cut!" The rockets died abruptly and a blast from the side ports threw the plane out of the beam and once out of it, beyond range of the electro-magnetic detectors as they were their coating of absolute black rendered the craft safe from observation.

"You didn't have to tell him they'd found some possibles did you?" "He did, unfortunately. He's had those plasmoid detectors of his for about a month, but he didn't happen to think of mentioning them. The reason he was to come back to Manon originally was to sort over the stuff the Fleets have been sending back here.

Finally the detectors encountered an obstacle, a conductive substance which the patterns showed conclusively to be practically pure iron. Iron an enormous mass of it floating alone out in space!

But I must confess that these breath detectors and other unscrupulous instruments they use have rather unnerved me." Bleak suddenly remembered, and thrust his hand in his hip-pocket. He pulled out the hank of white beard that had floated down from the airplane a few days before. It was much crumpled, but intact. "Good man!" cried Quimbleton. "My jolly old beard!"

"The detectors and lookouts will give ample warning of any attack, and Doctor Westfall has suggested that we should have all possible facts at hand before we try to decide upon a course of action. We should like to hear the full reports of Captain King, Captain Czuv, Chief Pilot Breckenridge, and Doctor Stevens."

"But won't the scouts and patrols be catching us pretty quick? The operator sent a warning." "Afraid the ether's empty, as far as we're concerned. They could neutralize our detector screens, and the scouts' detectors are the same as ours." Captain Bradley had stood by in silent astonishment during this conversation.

A magnetic detector was devised by Marconi while other inventors had contrived electrolytic, mercurial, thermal, and other forms of detector, used for the most part with a telephone receiver in order to detect minute variations in the current caused by the reception of the electro-magnetic waves. With one of Marconi's magnetic detectors signals from Cape Cod were read at Poldhu.

The invaders' ships were becoming invisible! The invisibility detectors were being overloaded now, and the hunt was hard, while the Nigrans were slipping past them and silently destroying Solarian ships! The molecular motion rays were quite effective on an invisible ship once it had been found.

They began to talk so learnedly of condensers and detectors that Herb wished more than once that he had started to make a set of his own, and he was at last driven in self defense to study up on the subject so as not to be left too far behind.