المؤلفون: Wiesner, Jerome B.

المصدر: Scientific American; Jan1957, Vol. 196 Issue 1, p46-51, 6p, 4 Black and White Photographs, 1 Graph

مصطلحات موضوعية: RADIO transmitters & transmission, RADIO wave propagation, TROPOSPHERIC radio wave propagation, IONOSPHERIC radio wave propagation, RADIO waves, TROPOSPHERIC ozone

المؤلفون: Grossman, Wendy M.

المصدر: Scientific American. Dec98, Vol. 279 Issue 6, p44. 2p. 1 Color Photograph.

مصطلحات موضوعية: *FLUORESCENT screens, *RADIO wave propagation, *EAVESDROPPING, *RADIO frequency modulation, *PREVENTION, *EQUIPMENT & supplies