"By the way, now, for a first time you see my apparatus om Houston street, which I used for obtaining oscillations, damped and undamped as well . But it was necessary to state that while others, who had been using my apparatus, but without my experience, have produced with it damped oscillations, my oscillations were almost invariably continuous, or undamped, because my circuits were so designed that they have a very small damping factor. Even if I operated with very low frequencies, I allways obtained continuous, or undamped, waves for the reason that I designed my circuits as nonradiative circuits." : Nikola Tesla
I conclude that the essence was in construction of device which oscillate even if powered by very low frequencies
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