At the turn of the century as telephone lines became available, it became popular to add telegraph onto telephone lines with an earth return phantom circuit.
32.
Rural distribution may be a single phase at a medium voltage; in some areas single wire earth return distribution is used when customers are very far apart.
33.
Bethel is also the site of a proposed major Alaskan coal-fired power station, and a unique prototype single-wire earth return electrical intertie to Napakiak, Alaska, constructed in 1981.
34.
On the return trip to Earth, the propulsion stage of the Earth Return Vehicle would be used as a counterweight to generate artificial gravity for the trip back.
35.
Upon reaching Mars, the upper stage would be jettisoned, with the Habitat Unit aerobraking into Mars orbit before soft-landing in proximity to the " Earth Return Vehicle ".
36.
On its return leg from Mars, a human mission may save tons of mass by capturing into DRO, and transferring to a parked Orion for Earth return and reentry.
37.
In Australia and New Zealand, remote loads are connected to the grid using SWER ( single-wire earth return ) transmission lines, since it is cheapest to run only one wire.
38.
To allow the through-running of L & YR trains, the conductor rail was moved to outside the running rails and the centre rail became the earth return until the 1920s.
39.
Single-wire earth return ( SWER ) or single wire ground return is a single-wire transmission line for supplying single-phase electrical power for an electrical grid to remote areas at low cost.
40.
Artist's rendering of Mars Semi-Direct / DRA 1.0 : The Manned Habitat Unit is " docked " alongside a pre placed habitat that was sent ahead of the Earth Return Vehicle.
