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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

Gravity-Plates  
  Reliable, controllable gravity force.  

It was motivated, he saw, by dual sets of gravity-plates, in separate space-tight compartments. One set was located in the extremely thick soles of the heavy boots; the other rested on the top of the helmet. He saw why this was. The gravity-plates for repulsion were those in the helmet; for attraction, those in the boot-soles. This kept the wearer of the suit always in an upright, head-up position.

... The suit was extremely heavy, particularly the boots, and Carse learned that the wearer was able to walk in it only because a portion of the helmet's repulsive force was continually working to approximate a normal body gravity.

From The Bluff of the Hawk, by Anthony Gilmore.
Published by Astounding Stories in 1932
Additional resources -

The gravity-plates could be switched on and off.

With a strength so enormous that it could overcome the force of the gravity-plates and his forward momentum, the creature tossed him free. Dizzy, he hurtled upward. But he knew that the bird's purpose was to impale him on the long steely spike of its beak as he came twisting down.

The lemak poised below, snout and spear-like beak raised. But it waited in vain, for Carse did not come dropping down. A touch of the control switch and he stayed at the new level, collecting himself.

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Additional resources:
  More Ideas and Technology from The Bluff of the Hawk
  More Ideas and Technology by Anthony Gilmore
  Tech news articles related to The Bluff of the Hawk
  Tech news articles related to works by Anthony Gilmore

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