National Humanities Center
National Humanities Center: America in Class: The Radio: Blessing or Curse? A 1929 Debate
Lesson on how the debate over commercial radio reflected American attitudes toward technological change in the 1920s. Includes teacher notes, background, strategies for text analysis and close reading questions as well as follow-up and...
Other
United States Early Radio History: The Versatile Audion
A reprint of an article from the magazine, "Electrical Experimenter," from February 1920, by H. Winfield Secor, describes some of the many practical uses to which the audion has been adapted.
Other
Ced Magic: 1906 Deforest Audion Vacuum Tube
This is a one page presentation of the historical development of the audion tube. An image of DeForest's invention is included.
Science Struck
Science Struck: Who Invented the Radio? Unraveling Its History
Discusses the long history of the radio and the work of the many scientists who contributed to its invention.
National High Magnetic Field Laboratory
Magnet Academy: Audion 1906
Two years after Englishman John Ambrose Fleming invented a two-electrode vacuum tube, American inventor Lee De Forest one-upped him by developing a tube with three electrodes.