The Fiber Optics Illustrated Dictionary - Part 64 fills a gap in the literature by providing instructors, hobbyists, and top-level engineers with an accessible, current reference. From the author of the best-selling Telecommunications Illustrated Dictionary, this comprehensive reference includes fundamental physics, basic technical information for fiber splicing, installation, maintenance, and repair, and follow-up information for communications and other professionals using fiber optic components. Well-balanced, well-researched, and extensively cross-referenced, it also includes hundreds of photographs, charts, and diagrams that clarify the more complex ideas and put simpler ideas into their applications context | Fiber Optics Illustrated Dictionary With optional air- or water-cooled heads different kilowatt output levels may be selected. See Barkhausen-Kurz tube cathode-ray tube cavity magnetron Klystron traveling-wave tube. magnetron history Germany Japan and America all contributed to the development of the magnetron in the 1920s and 1930s. Its origins date back to the work of H. Barkhausen and K. Kurz in Germany who described the shortest waves that could be produced by vacuum tubes in 1920. The invention of the magnetron itself is attributed to Albert W. Hull who described it publicly in the AIEE Journal in 1921. August Zacek may have made similar discoveries in the early 1920s as he ordered several special diodes which could have been used to study electron oscillations. In Japan Kinjiro Okabe proposed a divided anode-type magnetron in 1928 that helped further the practical applications of the magnetron. In 1935 A. Arsenjewa-Heil and 0. Heil described the concepts of velocity modulation and spatial bunching. In 1937 William Hansen and the Varian brothers designed and built a prototype Klystron tube capable of generating microwaves they announced their invention in 1939. In Japan Kiyoshi Morita ordered magnetron prototype tube from JRC and there was close coordination between the Naval Research Institute and JRC in the mid-1930s for building magnetron tubes directed in part by Shigeru Nakajima resulting in a water-cooled single-phase 500-W oscillator in 1939. In November 1939 John Turton Randall and Henry . Boot announced the first cavity magnetron within four years it had become an important aspect of radar technology. In the 1940s Percy LeBaron Spencer noted the magnetron s ability to produce thermal energy in substances exposed to the microwaves while researching magnetron radar applications. This led to the development of the microwave oven for which he applied for a patent in October 1945 . 2 495 429 . Early microwave ovens were called radar ranges. As .
