Beyond lighting bulbs, how did Tesla's World Wireless System propose to use the planet for wave propagation?

Answer

By coupling the transmitter to the Earth at a very low frequency

Tesla's system relied on coupling the transmitter to the Earth at a very low frequency, utilizing the planet itself as a massive conductor to propagate the waves across large areas.

Beyond lighting bulbs, how did Tesla's World Wireless System propose to use the planet for wave propagation?

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He Invented Wireless Light—So Why Was This Black Genius Erased?

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