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A quick look at Wikipedia page of Heinrich Hertz provides the right answer Heinrich Hertz proved the existence of the electromagnetic waves predicted by James Clerk Maxwell's equations of electromagnetism. It is neither for the discovery of frequency nor that EM had a frequency. The concept of frequency is as ancient as the concept of time. It just ...


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There is an interesting historical paper dealing with this issue: John Norton: Einstein’s Investigations of Galilean Covariant Electrodynamics prior to 1905 Einstein was aware before he wrote his famous 1905 special relativity paper, that the negative result of the Michelson-Morley experiment can be explained by an emission theory of light, in which there is ...


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Poisson first introduced the scalar potential to electrostatics. He takes it as well-known that, given a force between particles obeying an inverse square law, you can obtain the components of the force by taking partial derivatives of a scalar function equal to the sum of charges divided by their respective distances to that point. He arrives at this from ...


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There was nothing wrong with parageometrical optics mathematically, it just did not take. It happens. Compare Google ngram for parageometrical to the ngram for nomography. And nomography had everything, mathematical depth, intuitive appeal, wide use by engineers for computations and visualization, and yet we see the same decline of interest since 1960s. Why? ...


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A good bet is Christopher Cooper's The Truth about Tesla: The Myth of the Lone Genius in the History of Innovation, published in 2015 by Race Point Publishers.


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