Are there any pictures of Teslas rotating coherer? Also, what would allow electricity to be transmitted thru the earth to great distances?
The best image I know of is the drawing on page 99 of the Colorado Springs Notes, a copy of Tesla’s original drawing. About Tesla’s claim for transmission by earth currents with only minimal losses, he made a point of describing the process as being much the same as sending electricity through a wire. In his system the physical conductor is the earth itself. Compared with, say, copper wire, one might not think that dirt, rock, etc. would make a very good electrical conductor. Actually, the Earth’s vastly greater cross-sectional area provides a remarkably low resistance path for the flow of earth currents. . . .
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