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"We were essentially being shell-shocked by rapid change. That was one of the things you needed science-fiction writers for back in the Sixties, because we could cope with the future."
- Peter Watts

Beckerley Electrical Field  
  An energy field that can protect a city or large area.  

Each army is protected by one of those impenetrable Beckerley electrical fields...

She reached out one slim hand, and gently patted his knee. "About the Beckerley electrical fields. What are they? How do they operate?"

HE FROWNED thoughtfully, trying to phrase his answer in words that a girl would understand.

"It's an application of Morelle's experiment with electrical eddy currents," he said. "I'm a botanist, not an electrical engineer, but I know that the idea involves the refraction of lines of magnetic force.

"It works like this : Over each army on the Alaekan front the scientists have created a dome of electrical tension — a magnetic field. Any shell or drop bomb passing through this magnetic field is instantly heated to white heat by the electrical eddy currents induced in it by the field, and is thus caused to explode in mid-air.

"Every city is likewise protected by a Beckerlev field. You know how each auto-copter, on leaving the city limits of San Francisco, has to stop and be pushed through an iron-shielded subway until it's oeyond the Beckerley field?

Well, that's because the gasoline in the tank woula be heated to the flash point by the walls of its container."

From Smothered Seas, by R.M. Farley (w/SG Weinbaum).
Published by Astounding Stories in 1936
Additional resources -

Compare to the Langston Field from The Mote in God's Eye by Niven and Pournelle (1974).

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Additional resources:
  More Ideas and Technology from Smothered Seas
  More Ideas and Technology by R.M. Farley (w/SG Weinbaum)
  Tech news articles related to Smothered Seas
  Tech news articles related to works by R.M. Farley (w/SG Weinbaum)

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