Source: The Long Tail: Why the Future of Business Is Selling Less of More (2006), Ch. 9, p. 167
“Alternate currents, especially of high frequencies, pass with astonishing freedom through even slightly rarefied gases. The upper strata of the air are rarefied. To reach a number of miles out into space requires the overcoming of difficulties of a merely mechanical nature.”
"Experiments With Alternate Currents Of High Potential And High Frequency" http://www.tfcbooks.com/tesla/1892-02-03.htm an address to the Institution of Electrical Engineers, London (February 1892)
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