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"If you don't care about science enough to be interested in it on its own, you shouldn't try to write hard science fiction."
- Frederik Pohl

Jumper  
  Inertron belt results in effective weightlessness.  

Wilma cleared up for me the mystery of those flying leaps which she and her assailants had made, and explained in the following manner the inertron belt balances weight: "jumpers" were in common use at the time I "awoke," though they were costly, for at that time inertron had not been produced in very great quantity. They were very useful in the forest. They were belts, strapped high under the arms, containing an amount of inertron adjusted to the wearer's weight and purposes: In effect they made a man weigh as little as he desired; two pounds if he liked.
From Armageddon: 2419 A.D., by Philip Frances Nowlan.
Published by Amazing Stories in 1928
Additional resources -

A substance very similar to H.G. Wells' cavorite and Percy Greg's apergy. See also the jump harness from Robert Heinlein's Stranger's in a Strange Land.

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Additional resources:
  More Ideas and Technology from Armageddon: 2419 A.D.
  More Ideas and Technology by Philip Frances Nowlan
  Tech news articles related to Armageddon: 2419 A.D.
  Tech news articles related to works by Philip Frances Nowlan

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