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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.
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 ...
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.
The film focused primarily [5] on the three pioneers [6] of radio in America: Lee de Forest, Edwin Howard Armstrong, and David Sarnoff. [7] The program interspersed audio and musical highlights of "old time" radio with the stories, achievements, failures, scams and bitter feuds between each of the main protagonists. [8]
Phonofilm is an optical sound-on-film system developed by inventors Lee de Forest and Theodore Case in the early 1920s. In 1919 and 1920, de Forest, inventor of the audion tube, filed his first patents on a sound-on-film process, DeForest Phonofilm, which recorded sound directly onto film as parallel lines. These parallel lines photographically ...
Journal of Forest and Environmental Science: journal home: Institute of Forest Science - Kangwon National University: 1980–present English (some first issues in Korean) 4 issues per year Journal of Forest Research: journal home: Taylor & Francis and Japanese Forest Society 1996–present English 6 issues per year Journal of Forest Planning ...
The Federal Ministry of Innovation, Science and Technology is a Nigerian ministry whose mission is to facilitate the development and deployment of science and technology apparatus to enhance the pace of socio-economic development of the country through appropriate technological inputs into productive activities in the nation.
In 1997, Nigeria's areas of estimated forest plantation was 150,000 hectares. Between 1970 and 1984, 82,434 hectares of plantation were established. [5] By 1998, Nigeria has 196,000 ha and 704 ha in protected areas outside the forest reserves. Between 1985 and 2005, three percent of Nigeria's forest reserves were plantations. [4]