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"In 1970 I found little difficulty staying 30 years ahead of the man in the street, and now I find it difficult to stay 18 months ahead of the man on the street."
- Vernor Vinge

Electric Wall  
  A wall of electric force.  

The whole camp was enclosed and protected by a shimmering blue dome of electric force. This emanated from a heavy copper cable that completely encircled the clearing, and which drew its power from insulated cables that led into the ship to generators driven by the few cyclotrons still functioning. This protective electric wall had been set up at John Dark's orders to keep out the dreaded Vestans.
From The World With A Thousand Moons, by Edmond Hamilton.
Published by Amazing Stories in 1942
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