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"[Science fiction] is the one literary medium left in which we have a free hand. We can do any damn thing we please."
- Alfred Bester

Force-Field  
  A barrier to objects, created by projected forces.  

The notion of a force-field is widely used in science fiction; this is the first reference I know about.

They approached the aero fearlessly, appearing now as suits of red and white metal with crystal head-pieces above which protruded luminous green horns. As the little figures sped upward or came to rest, these correspondingly came together or diverged, showing that by interaction between them and a force field of some sort these individual flyers were propelled. Where hands would have been, on Earth, twin pivoted ray-tubes were fastened.
Technovelgy from A Subterranean Adventure, by George Paul Bauer.
Published by Wonder Stories in 1930
Additional resources -

John W. Campbell picked up on this idea in Islands of Space (1931):

Arcot had used the force field that produced the directed motions of the molecules as a weapon.

Here's another very early reference, from 1931, by 'Doc Smith writing in Space Hounds of IPC:

He first called Mars, the home planet of Alcantro and Fedanzo, the foremost force-field experts of three planets; and was assured in no uncertain terms that those rulers of rays were ready and anxious to follow wherever Brandon and Westfall might lead.

Compare to other early ideas about projecting force, like attractive ray from Edmond Hamilton's 1928 novel Crashing Suns or the super-photon ray from Campbell's 1932 story Invaders from the Infinite.

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Additional resources:
  More Ideas and Technology from A Subterranean Adventure
  More Ideas and Technology by George Paul Bauer
  Tech news articles related to A Subterranean Adventure
  Tech news articles related to works by George Paul Bauer

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