Gravity Generator

Gravity generators were a form of technology used to simulate the gravity of a planet in a zero gravity environment, such as a spacecraft or space station. This was usually for the benefit of space travelers in a spacecraft: Artificial gravity facilitated movement, prevented objects from floating around a spacecraft's cabin and prevented beings from losing muscle mass due to gravity deprivation.

Mechanism
Primitive gravity generators employed centrifugal force: A spacecraft, or a part thereof, would spin, and the centrifugal force experienced would simulate gravity.

Magnetic fields were also occasionally used to simulate gravity, but these had limitations as they only affected ferromagnetic materials.

Modern gravity generators were, in effect, inverted repulsorlifts, using traherism to hold objects and beings to the floor, simulating a planet's gravity.