More than 35 years ago, I undertook the production of these phenomena (of lightning) and, in 1899 I actually succeeded, using a generator of 2,000 horsepower, in obtaining discharges of 18,000,000 volts carrying currents of 1,200 amperes, which were of such power as to be audible at a distance of 13 miles. I also learned how to produce such lightnings as occur in Nature, and mastered all the technical difficulties in this connection. But I found that even in the small and comparatively negligible trigger work called for the employment of thousands of horsepower; and this is the great obstacle now in the way of this supreme accomplishment.
Nikola Tesla QuotesProfound words from the world's greatest inventor
Nikola Tesla Quote #56