Planet earth: radio waves [B&W]
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Discusses the electromagnetic spectrum, the history of its discovery, the theory and research done on radio waves and the ionosphere which girdles the earth. Explains the ionosphere, how it is explored and used for radio communications, and the new science of radio-astronomy which is probing far beyond our galaxy.
Sources
- 16mm Filmography (legacy record) — title, description, catalog record
Original permalink · Record added 2026-01-23 03:55:20