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"All fiction is propaganda, and the fiction we like is the propaganda we believe in, and the fiction we don't like is the propaganda we don't believe in."
- Samuel R. Delany

Granton Motor  
  Spacecraft propulsion system based on gravital radiation.  

The author of this story presents another variation on the idea of a gravity-based propulsion system.

So they built the Granton motor... It was a beautiful little thing, though, when Granton had finished; compact and efficient, and almost indestructible. The principle of it was simple: gravital radiation.

Granton had never been able to understand why gravitation had always been called a "pull"; every phenomenon known concerning the force of gravity would fit as well into the framework of a repulsive theory. He had gone on that principle: that gravity is not a pull, but a pressure pervading all space. The Granton motor was attuned to the matter-radiations of the earth, and it was insulated against the influences of the other worlds of space. It acted as a super-transformer unit, infinitely sensitive in its receiving cells to the pressure of the earth; the result was tremendous propulsive power. In operation tests it proved to be nearly ninety-nine percent efficient - as close to perfect as any manbuilt mechanism could come; harnessed to a space ship, it would be just about the ideal thing for interplanetary travel.

From Into the Meteorite Orbit, by Frank K. Kelly.
Published by Teck Publications in 1933
Additional resources -

You might want to compare this pseudoscience of spacecraft propulsion with some similar gravity-related systems - apergy (1880) and Cavorite (1901).

Compare to these propulsion systems: Light Pressure Propulsion (1867), apergy (1880), Beam-Powered Propulsion (1931), Granton motor (1933), Vibration-Propelled Cruiser (1928), geodynes (1936), ion drive (1947), Planetary Propulsion-Blasts (1934), stardrive (1953), solar sail (light sail) (1962), Lyle drive (1961), laser cannon (1966), Bussard ramjet (1976), asymptotic drive (1976), Interstellar Laser Propulsion System (1985).

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Additional resources:
  More Ideas and Technology from Into the Meteorite Orbit
  More Ideas and Technology by Frank K. Kelly
  Tech news articles related to Into the Meteorite Orbit
  Tech news articles related to works by Frank K. Kelly

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