Gyrogravitics And Graviton Polarity Generators

Poul Anderson's gyrogravitics:

moves spaceships between planets;
keeps air and heat on asteroids;
moves a terraformed asteroid to Alpha Centauri slower than light.

James Blish's graviton polarity generators:

keep air on cities in space;
move spaceships and cities between stars faster than light;
move a planet between galaxies faster than light.

Gyrogravitics are a poor man's graviton polarity generators.

So far, we have compared Anderson's Tales Of The Flying Mountains to other future histories by:

Wells
Heinlein
Asimov
Blish
Niven
Pournelle
Anderson
Aldiss

Tales describes the Asteroid Revolution whereas Wells' The Shape Of Things To Come describes a Terrestrial Revolution.