Vilhelm_Bjerknes (1862-1951

Norský fyzik. Jeden ze zakladatelů moderní meteorologie, čili předpovědi počasí, a fyzikální hydrodynamiky.

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Popisuje proudění tekutin a jejich porovnání s elektromagnetismem včetně doprovodných ověřovacích pokusů.

Cituje Maxwella, který si byl vědom neúplnosti popisu elektromagnetismu:

It must be carefully born in mind that we have only made one step in the theory of the action of the medium. We have supposed it to be in a state of stress but have not in any way accounted for this stress, or explained how it is maintained …
I have not been able to make the next step, namely, to account by mechanical considerations for these stresses in the dielectric.

Between bodies pulsating in the same phase there is an apparent attraction; between bodies pulsating in the opposite phase there is an apparent repulsion, the force being proportional to the product of the two intensities of pulsation, and proportional to the inverse square of the distance.