The “Kennelly-Heaviside” Layer


EVERY radio engineer is familiar with what is called the “Heaviside Layer” and its supposed functions. I find, however, that the hypothesis of an electrically conducting stratum in the upper air was clearly enunciated in an article by Prof. A. E, Kennelly, of Harvard University, published in the Electrical World and Engineer of New York on March 15, 1902. The official date of Heaviside's disclosure of his hypothesis is December 19, 1902. About the same date H. Poincaré, A. Blondel, and C. E. Guillaume made similar hypotheses. If names are to be attached to this hypothetical layer it should be called, in equity, the “Kennelly-Heaviside” layer, a name which is beginning to be used in America.

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    E. C. Titchmarsh, "Extensions of Fourier's Integral Formula to formulae involving Bessel Functions", Proc. London Math. Soc. (2) 23 (1925), xxii. (Records for Jan. 17, 1924.).

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RUSSELL, A. The “Kennelly-Heaviside” Layer. Nature 116, 609 (1925).

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