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by polynomial 2339 days ago
> Hertz'ian radiations undoubtedly refers to EM

Specifically, EM with both longitudinal and transverse components which Tesla learned about at the 1889 Exposition Universelle (where the Eiffel tower was "unveiled") and against which he postulated EM waves with no transverse component (sometimes called Tesla waves, which is not to imply they really exist in nature.)

Edit: random downvote w/o a reply, classy!