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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.
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.
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 ...
He developed the De Forest method of wireless telegraphy and founded the American De Forest Wireless Telegraph Company. De Forest was a distinguished electrical engineer and the foremost American contributor to the development of wireless telegraphy and telephony. The elements of his device take relatively weak electrical signals and amplify them.
Download as PDF; Printable version; ... Lee de Forest (1873–1961), U.S. ... first science films in the world in the neurology clinic in Bucharest (1898–1901)
31 December 1906: Lee de Forest experiments with a "continuous wave" arc converter to transmit audio amplitude modulated (AM) audio across a lab room. February 1907: de Forest transmits electronic telharmonium music from his laboratory station in New York City. [36]
Although Lee de Forest initially discounted Armstrong's findings, beginning in 1915 de Forest filed a series of competing patent applications that largely copied Armstrong's claims, now stating that he had discovered regeneration first, based on a notebook entry made on August 6, 1912, while working for the Federal Telegraph company, prior to ...
For about three months, Lee de Forest, who eventually went on to design the audio vacuum tube that provided the breakthrough for radio, worked on the project with Johnson. [ 5 ] Johnson also sought to form an automobile company, introducing first a steam-powered truck and then a line of automobiles using gasoline-powered engines.