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"To get anywhere, or even live a long time, a man has to guess, and guess right, over and over again, without enough data for a logical answer."
- Robert Heinlein

Negative Safety-Field  
  A paragravity-based shield for space craft.  

"Only the particles with freak velocities can touch us," Drake went on. "We have a negative safety-field, that will stop everything under ten kilometers a second, and deflect a good deal of the rest."

The ugly face of Biggs showed a stubborn disbelief, and he tried to explain: "You can feel the peegee [paragravity] field, here in the ship, that holds you against the deck and keeps you from being space-sick? Well, there's a similar field around the hull, pushing away - you couldn't hit us with a rifle from fifty meters."

From Collision Orbit, by Jack Williamson.
Published by Astounding in 1941
Additional resources -

Compare to the force field from Islands of Space (1931) by John W. Campbell and the Langston field from Niven and Pournelle's 1974 classic The Mote in God's Eye.

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Additional resources:
  More Ideas and Technology from Collision Orbit
  More Ideas and Technology by Jack Williamson
  Tech news articles related to Collision Orbit
  Tech news articles related to works by Jack Williamson

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