The authoritative Encyklopädie der mathematischen Wissenschaften states: "N. Umov in 1874 had already solved a problem of the movement of energy in liquid and elastic media in completely generalized view. However, the intense attention to this view has been attracted only after Poynting had presented a stream of electromagnetic energy based on Maxwell equations" ten years later than Umov's publications.
Poynting vector, a representation of the energy flux of an electromagnetic field
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Poynting's theorem on conservation of energy in electromagnetic field
Poynting vector | Poynting's theorem | Poynting | John Henry Poynting |