On This Day in Telephone History September 3RD 1883 Harold Deforest Arnold was Born. An American physicist, in 1928 received award for development of 3-electrode high vacuum thermionic tube. His research led to the development of long-distance telephony and radio communication. He worked at Western Electric on thermionic tubes, which amplified radio and telephone signals, leading to transcontinental telephony. He was director of research at Western Electric from 1917 to 1924, and in 1925 he was appointed the first director of research of the Bell Telephone Laboratories.

On This Day in Telephone History September 3RD 1883

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On This Day in Telephone History September 3RD 1883 Harold Deforest Arnold was Born. An American physicist, in 1928 received award for development of 3-electrode high vacuum thermionic tube. His research led to the development of long-distance telephony and radio communication. He worked at Western Electric on thermionic tubes, which amplified radio and telephone signals, leading to transcontinental telephony. He was director of research at Western Electric from 1917 to 1924, and in 1925 he was appointed the first director of research of the Bell Telephone Laboratories.