"Cecil Moore" wrote
...
Szczepan Bia³ek wrote:
Even famous Pointing vector was born in fluids by Umov.

It's "Poynting" vector, named after John Henry Poynting.

http://en.wikipedia.org/wiki/Poynting_vector
"The Umov-Poynting vector[6] discovered by Nikolay Umov in 1874 describes
energy flux in liquid and elastic media in a completely generalized view."

Poynting "discovered" it in 1884.
"He was the developer and eponym of the Poynting vector, which describes the
direction and magnitude of electromagnetic energy flow and is used in the
Poynting theorem, a statement about energy conservation for electric and
magnetic fields. This work was first published in 1884. "

The same is with Maxwell math. Helmholtz wrote such for his whirls.
Many people are thinking in the same time about the same think.
I am not alone in the "Acoustic analogy".
S*