Now steam has undoubtedly been a great Concentrator, but electricity, which is likely to take its place in the future, will to all appearance be as great a distributor.
"Contemporary Socialism"
John Rae
"But a more effective weapon, if these men are as I expect them to be, will be a peculiarly effective magnetic field Concentrator device, which will project a magnetic field as a beam for a mile or more.
"Invaders from the Infinite"
John Wood Campbell
With a late model oxygen Concentrator, one would have no trouble at all existing there.
"The Planetoid of Peril"
Paul Ernst