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Lee de Forest was born in 1873 in Council Bluffs, Iowa, the son of Anna Margaret (née Robbins) and Henry Swift DeForest. [1] [2] He was a direct descendant of Jessé de Forest, the leader of a group of Walloon Huguenots who fled Europe in the 17th century due to religious persecution.
In 1906, Lee De Forest of the US added a control "grid" to the valve to create an amplifying vacuum tube RF detector called the Audion, leading Fleming to accuse him of infringing his patents. De Forest's tube developed into the triode the first electronic amplifier. The triode was vital in the creation of long-distance telephone and radio ...
January 12–13 – Lee De Forest conducts an experimental broadcast of part of a live performance of Tosca and, the next day, a performance with the participation of the Italian tenor Enrico Caruso from the stage of Metropolitan Opera House in New York City. [23] [24]
Contributions; Talk; List of inventors ... Lee de Forest (1873–1961), U.S. ... Romania – first science films in the world in the neurology clinic in Bucharest ...
De Forest continued to claim that he developed the Audion independently from John Ambrose Fleming's earlier research on the thermionic valve (for which Fleming received Great Britain patent 24850 and the American Fleming valve patent U.S. patent 803,684), and de Forest became embroiled in many radio-related patent disputes. De Forest was famous ...
He did this by making major improvements to the vacuum tube design of Lee de Forest, increasing the amplification capacity substantially. In February–March 1914, Tigerstedt demonstrated his sound-on-film technology to a small group of scientists, using his own film Word and Picture .
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The first commercial AM Audion vacuum tube radio transmitter, built in 1914 by Lee De Forest who invented the Audion in 1906. During the mid-1920s, amplifying vacuum tubes revolutionized radio receivers and transmitters. John Ambrose Fleming developed a vacuum tube diode. Lee de Forest placed a screen, added a "grid" electrode, creating the triode.