Far higher above the earth than any balloon has ever ascended lies a series of curved shells of electrified air which scientists call the ionosphere. From this ionized region of upper space radio waves carom and curl around the earth. For two years Carnegie Institution's Department of Terrestrial Magnetism has had under way a program of ionosphere research mustering a platoon of scientists and ranging from the tropics to the far North. At the Naval Research Laboratory in Washington, Dr. Edward Olson Hulburt kept track of the work, conferred with the workers. Last...
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