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"...in fifty years, do you believe that people will be recognizably human?"
- Greg Bear

Artificial Gravity System  
  Producing a gravity field without a large nearby mass.  

This mention narrowly misses first - I think that Ray Cummings might have edged him out with Brigands of the Moon published March of 1930.

An "artificial gravity" system, based on the properties of the electro-magnetic field, could be turned on and regulated at will, so as to maintain a more or less normal environment for the human organism.
From Last and First Men, by Olaf Stapledon.
Published by Not known in 1930
Additional resources -

See the entry for city of space (from The Prince of Space, by Jack Williamson, 1931) for a discussion of centrifugal force-provided "gravity" for space stations in the The Problem of Space Travel - The Rocket Motor, written by Herman Potočnik in 1928.

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Additional resources:
  More Ideas and Technology from Last and First Men
  More Ideas and Technology by Olaf Stapledon
  Tech news articles related to Last and First Men
  Tech news articles related to works by Olaf Stapledon

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