PBS
People and Discoveries: Lee De Forest
A biography on audion inventor, Lee de Forest, from childhood on. Hyperlinks to additional information about the radio and broadcasting.
PBS
Outline of the History of the Transistor: Lee De Forest
Part of a larger site about the history of the transistor, this brief biography of Lee de Forest, the inventor of the audion, includes a QuickTime movie that shows how it worked.
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.
Massachusetts Institute of Technology
Mit: Invention of the Week: Lee De Forest
This website provides information on the life and inventions of Lee DeForest, the man who invented the audion tube, which made commercial radio broadcasting practical.
National High Magnetic Field Laboratory
Magnet Academy: Audion
In 1906, American physicist Lee De Forest invented the Audion (or triode), building on John Fleming's discovery of the diode just a few years before.
National High Magnetic Field Laboratory
Magnet Academy: Lee De Forest
American inventor Lee De Forest was a pioneer of radio and motion pictures. He received more than 300 patents over the course of his lifetime, the most important of which was for a three-electrode vacuum tube, or triode, that he called...
Famous Scientists
Famous Scientists: Lee De Forest
Learn about the life and discoveries of Lee De Forest in this article.
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.