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Captain Henry Joseph Round (2 June 1881, Kingswinford, Staffordshire, England–17 August 1966, Bognor Regis) was one of the early pioneers of radio and received 117 patents. He was the first to report observation of electroluminescence from a diode, leading to the discovery of the light-emitting diode. He was a personal assistant to Guglielmo Marconi. Henry Joseph Round was the eldest child of Joseph and Gertrude Round and was born on 2 June 1881. He spent his early years in the small town of Kingswinford which is in Staffordshire. Henry Round undertook much of his early education at Cheltenham Grammar School. He later attended the Royal College of Science, a constituent college of Imperial College London where he gained a first class honours degree. Round joined the Marconi Company in 1902; not long after Marconi had made his transatlantic wireless transmission. He was sent to the USA where he experimented with a variety of different aspects of radio technology, focusing on technologies such as powdered iron cored tuning inductors. He also performed some experiments with transmission paths over land and sea at different times of the day and investigated direction finding, for which he used a frame antenna. ==Vacuum tube development== Round made important contributions to development of the first vacuum tubes. He headed Marconi's research program into thermionic tubes, and developed a three-element (triode) amplifying tube at roughly the same time as Lee De Forest was developing the Audion in the US. He discovered feedback (regeneration) in vacuum tubes independently along with Alexander Meissner and Edwin Armstrong, and built some of the first AM vacuum tube radio transmitters. He patented the first design for an indirectly heated cathode, the type of cathode widely used in vacuum tubes today. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「H. J. Round」の詳細全文を読む スポンサード リンク
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