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"As the rate of technological development speeds up, the gap between science fiction and what we’re living now is getting narrower all the time."
- Richard Morgan

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.
Technovelgy from 50th Century Revolt, by A.G. Stangland.
Published by Wonder Stories in 1932
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'If Anyone Is Watching Earth...'
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'...a synthetic which air-friction would erode.'

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'The sky is the limit' just got higher.

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