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F. W. Jordan
Frank Wilfred Jordan (1882 - ? ) was a British physicist who together with William Henry Eccles invented the so-called "flip-flop" circuit in 1918.〔William Henry Eccles and Frank Wilfred Jordan, "Improvements in ionic relays" British patent number: GB 148582 (filed: 21 June 1918; published: 5 August 1920). Available on-line at: http://v3.espacenet.com/origdoc?DB=EPODOC&IDX=GB148582&F=0&QPN=GB148582 .〕〔W. H. Eccles and F. W. Jordan (19 September 1919) "A trigger relay utilizing three-electrode thermionic vacuum tubes," ''The Electrician'', vol. 83, page 298. Reprinted in: ''Radio Review'', vol. 1, no. 3 , pages 143–146 (December 1919).〕 This circuit became the basis of electronic memory in computers.
Frank Wilfred Jordan was born in 1882 in Canterbury, Kent, England, the son of Edward James Jordan and Eliza Edith (maiden name unknown).〔Date and place of birth: "England and Wales Census of 1901" in ''FamilySearch.org'' : https://familysearch.org/pal:/MM9.1.2/16TV-F3T/p_10237216516 . See also: "England and Wales Census of 1911" in ''FamilySearch.org'' : https://familysearch.org/pal:/MM9.1.2/1PFK-6S2/p_10369204380 . Parents: "England Births and Christenings, 1538-1975" in ''FamilySearch.org'' : https://familysearch.org/pal:/MM9.1.2/9W86-PK5/p1 .〕 Jordan received his secondary education at the Simon Langton Grammar School for Boys in Canterbury, Kent, England.〔''University of London General Register: part 3'' (May 1, 1901), page 341.〕 From 1899 to 1904, he was a student at the Royal College of Science,〔Currently (2008) the Royal College of Science is a constituent college of the Imperial College London.〕 from which he graduated with an Associateship in physics and a master of science degree.〔''Register of Old Students and Staff of the Royal College of Science'' (1936), page 33. Here Jordan is listed as having been a "Lecturer in Physics and Mathematics, Municipal College, Portsmouth."〕〔On page 225 of the following article, Jordan is described as "Mr. F. W. Jordan, B. Sc., Teacher in Training in the Department of Astronomical Physics, Royal College of Science." See: A. Fowler (1904) "The spectrum of Antarian stars in relation to the fluted spectrum of titanium," ''Proceedings of the Royal Society of London'', vol. 73, pages 219–225.〕 In 1912 he was a "lecturer in physics", presumably at the Royal College of Science.〔See following patent: Frank Wilfred Jordan, "Improvements relating to radiometers, thermogalvanometers, and the like" British patent number: GB 191226631 (filed: 1912; published: 20 November 1913).〕 In 1918 he was an "electrician" at City and Guilds Technical College.〔See first page of the following patent: William Henry Eccles and Frank Wilfred Jordan, "Improvements in ionic relays" British patent number: GB 148582 (filed: 21 June 1918; published: 5 August 1920).〕 There is little else known about him.
This flip-flop circuit became perhaps the most important circuits in computer technology, allowing memory to be stored.
== Footnotes ==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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