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"Everything starts as somebody's daydream. And, when you're daydreaming, it is science fiction. It's when you start work out how you put it together, true science fiction becomes real science."
- Larry Niven

Gravity Nullifier  
  Shields a large object from the effect of gravity.  

But back to the building. You see, instead of scattering building material all over the country with its consequent material and social waste, we have a central construction plant located near the source of material. Here buildings are constructed on barges and when the structure is ready for delivery a portable gravity nullifier is lowered into the barge, the gravity is nullified and an air tug makes fast, towing it to any part of the world. It is merely a development incredible astonishment, He turned to the captain, but that officer was wrapped in his own thoughts and took no notice of the unbelievable procession trailing through the sky. Thinking that he might _ be “seeing things” Addison hesitated.

...Addison felt the queer sensation as the gravity was nullified and grasped a railing to keep from being flung about the room. He felt pressure against the floor as the ship accelerated on its ascent and the peculiar sensation of being urged toward the ceiling when the upward motion was brought to a stop. He felt the inertia of his body again as they accelerated their forward speed while he listened to the captain giving orders to the head surgeon and to the entire crew.

From The Sky Maniac, by Henri Dahl Juve.
Published by Air Wonder Stories in 1929
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