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"Individual science fiction stories may seem as trivial as ever to the blinder critics and philosophers of today -- but the core of science fiction, its essence has become crucial to our salvation if we are to be saved at all."
- Isaac Asimov

Repulsor  
  A device that inhibits the action of a spacewarp drive.  

"Anyway, you couldn't crash into the moon because you've got a safety factor - this repulsor dial. If you want to materialize ten miles above the moon - and that's about the right distance - you set your repulsor for ten miles and it stops you ten miles short of the objective you've sighted on."
Technovelgy from What Mad Universe, by Frederic Brown.
Published by E.P. Dutton in 1949
Additional resources -

This device halts the action of a spacewarp drive, providing a needed element of control.

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Additional resources:
  More Ideas and Technology from What Mad Universe
  More Ideas and Technology by Frederic Brown
  Tech news articles related to What Mad Universe
  Tech news articles related to works by Frederic Brown

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Science Fiction in the News

The New Habitable Zones Include Asimov's Ribbon Worlds
'...there's a narrow belt where the climate is moderate.'

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'It was riddled with holes that were the mouths of tunnels.'

Humanoid Robots Tickle The Ivories
'The massive feet working the pedals, arms and hands flashing and glinting...'

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'There is a philosophical problem of some difficulty here...'

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'There were cubic miles of it, and it glistened like a silvery Christmas tree...'

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'On the chest of drawers something was perched.'

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'Jason had been guiding the caravan of cars as usual...'

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'There was a wall ahead... It was riddled with holes that were the mouths of tunnels.'

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