Contragravity

Definition and stakes

Portrait of H. Beam Piper H. Beam Piper,  Uller Uprising

“ The larger of the specks that had appeared on the horizon resolved itself into a handling-machine, a thing [4] like an oversized contragravity-tank, with a bulldozer-blade, a stubby derrick-boom instead of a gun, and jointed, claw-tipped arms to the sides. The smaller dots grew into personal armor—egg-shaped things that sprouted arms and grab-hooks and pushers in all directions. The man with the grizzled beard began talking rapidly into his hand-phone, then hung it up. There was a series of bumps, and the armor-tender, weightless on contragravity, shook as the handling-machine came aboard. ”
Source: Gutenberg

Portrait of H. Beam Piper H. Beam Piper,  Little Fuzzy

“ He watched the car lift away, and then looked out over the city—a vista of treetop green, with roofs and the domes of shopping centers and business centers and amusement centers showing through, and the angular buttes of tall buildings rising above. The streetless contragravity city of a new planet that had never known ground traffic. The Fuzzies could be hiding anywhere among those trees—or they could all be dead in some man-made trap. He thought of all the deadly places into which they could have wandered. ”
Source: Gutenberg

Portrait of H. Beam Piper H. Beam Piper,  Ullr Uprising

“ One side's living' quarters for a six-man crew—sometimes the gang's out for as long as a week at a time—and the other side's a workshop."
That sounded interesting. With contragravity, of course, terms like "escape-velocity" and "mass-ratio" were of purely antiquarian interest.
"How long," he asked Pearson, "would it take to fit that vehicle with a full set of detection instruments—radar, infrared and ultraviolet vision, electron-telescope, heat and radiation detectors, the whole works—and spot it about a hundred to a hundred and fifty miles above Keegark?"
”
Source: Gutenberg

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