Abstract
THE mode of propagation of electric waves along the surface of the earth has been investigated theoretically since the earliest days of practical radio communication, and a paper by A. Sommerfeld published in 1909 has since become a classical treatise on this subject. After a period during which attention was mainly confined to the study of wave propagation through the ionosphere, the inception of broadcasting and the practical application of ultra-short waves have caused renewed interest in the problem of propagation along the ground.
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Propagation of Radio Waves Along the Earth. Nature 145, 234 (1940). https://doi.org/10.1038/145234a0
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DOI: https://doi.org/10.1038/145234a0