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"I don't know why I write science fiction. The voices in my head told me to!"
- Charles Stross

Negative Gravity Field  
  Antigravity effect produced for space ship propulsion.  

For twenty or thirty miles into the back-bone of the Andean mountains massive reinforced steel tubes were driven to withstand the terrific constant strain of the tubes as they sent forth a vast field of gravitation, retarding the motion of the planet. The huge gravity screens of the tubes fed on large vats of silicon dust which broke down atomically, releasing a powerful negative field of gravity.
From 50th Century Revolt, by A.G. Stangland.
Published by Wonder Stories in 1932
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