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The sigma-ray needler, which he carried, was the only weapon which could be used, under the circumstances. It had no effect whatever on any material structure and could be used inside an activated conveyer without deranging the conductor-mesh, as, say, a bullet or the vibration of an ultrasonic paralyzer would do, and it was instantly fatal to anything having a central nervous system.
Instead, they operate in bursts, in a random pattern. They might send out a beam twice in a minute, or wait an hour between bursts. The beam is a powerful one. It's effective for an extraordinary distance." "The wail, of course, was the beam operating," Zircon interjected. "You didn't hear the beam itself, since that's ultrasonic. But you did hear the mechanical vibration of the brass ball.
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