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"If you don't care about science enough to be interested in it on its own, you shouldn't try to write hard science fiction."
- Frederik Pohl

Geofractor Shield  
  Protects the bearer against unwanted geofractor use.  

Such a powerful tool as the geofractor must have a counter.

“So that’s the geofractor!” he wheezed. “Ah, a fearful thing!”

“So Derron has made it,” the girl whispered bitterly. “But my father intended it for purposes of peaceful communication. He dreamed of a timeless interplanetary express service. He even hoped to make wide stellar exploration possible, so that human colonists could spread across the galaxy.

“Yet he realized the supreme danger of his discovery. I doubt that he would ever have finished it at all, but for the bitter straits of mankind hi the cometary war. He completed it only as a weapon of last resort—and he provided a shield against it.”

“Eh?” Giles Habibula stared at her. “A shield?”

The girl touched her white, six-pointed jewel.

“This contains a tiny, atom-powered achronic field-coil,” she told him. “It is adjusted to create a spherical barrier zone, that the search and refractor fields of the geofractor cannot penetrate.

From One Against The Legion, by Jack Williamson.
Published by Astounding in 1939
Additional resources -

Compare to the life-shield blanket from Heretics of Dune (1984) by Frank Herbert, the radiant shield from The Houses of Iszm (1954) by Jack Vance, the life detector shield from Cease Fire (1958) by Frank Herbert, the protective shield from Triplanetary (1934) by 'Doc' Smith and the personal force-shield from Foundation (1951) by Isaac Asimov.

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Additional resources:
  More Ideas and Technology from One Against The Legion
  More Ideas and Technology by Jack Williamson
  Tech news articles related to One Against The Legion
  Tech news articles related to works by Jack Williamson

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