Powerful ultraviolet light sources
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R.H.O.
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Article
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1941
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Elsevier Science
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English
β 120 KB
Oct., I94I.] CURRENT TOPICS. 4OI developments of international broadcasting in the R. C. A. Review explains that directive aerials are designed with the proper compromise between power gain and beam width, because one is obtained at the expense of the other. For instance, a beam broad enough to "se