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"the [science fiction] writer should be able to convince the reader (and himself) that the wonders he is describing really can come true...and that gets tricky when you take a good, hard look at the world around you."
- Frederik Pohl

Electronized Gravity Plate  
  Artificial gravity for use on space stations and spacecraft.  

A very useful device; some version of this is provided (usually without comment) on most sfnal spacecraft.

The Bolar current, popularly misnamed the paralyzing ray, has no effect whatever of a physical paralysis. It merely generates a sudden gravitational force, transitory, but of extreme intensity so that the victim stands momentarily "rooted to the ground." The subject is highly technical of explanation. The affected material object does not gain an extreme weight, as in the case of an electronized gravity plate with full attractive force: the paralyzing beam acts more in the nature of magnetism - at the contact point of the affected object and the ground into which the Bolar current is discharged.
From Blood of the Moon, by Ray Cummings.
Published by Thrilling Wonder Stories in 1936
Additional resources -

Compare to the artificial gravity from Last and First Men (1930) by Olaf Stapledon, and to the more practical solution - the city of space, presented by Jack Williamson in his 1931 story The Prince of Space.

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Additional resources:
  More Ideas and Technology from Blood of the Moon
  More Ideas and Technology by Ray Cummings
  Tech news articles related to Blood of the Moon
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