In the beginning of this century a Croatian* engineer, emigrant to America, Nikola Tesla, measured the electrical charge of the planet Earth and found it of a very high potential. He made his observation during thunder storms.
Nikola Tesla was a pioneer in many fields of electrical theory and technology. He was the first to utilize alternating current, conceiving an effective system for its generation, transmission, and utilization. Edison appealed to the public, warning that the alterating current of Tesla would cause great harm to its users, being dangerous, and that only direct current can be harmlessly used. Tesla referred to Edison as an inventor, to himself as a discoverer. Today everyone knows that alternating current, with the help of the polyphase induction motor, can be converted into mechanical energy more effectively and economically than direct current. He invented new forms of dynamos, transformers, condensers, and induction coils. He discovered the principle of the rotary magnetic field, upon which the transmission of power from the Niagara Falls and other waterfalls and dams is carried on. A regal recluse, he despised the short-seeing men of science. Many of his pioneer inventions he carried with him to his grave. But he believed in the destiny of man who, in his words, searches, discovers and invents, designs and constructs, and covers with monuments of beauty, grandeur and awe, the star of his birth.
This teaches us that not only have the contempories of a revolutionary idea in science repeatedly rejected the idea, but also that a rejection of such an idea even by the best qualified men in the field in the generation of the revolutionary, and often still in the following generations, has occurred not once or twice, but many times. Archimedes rejected the heliocentric system of Aristarchus; Brahe rejected the system of Copernicus; and Galileo was deaf and blind to the discoveries of Kepler, just as Edison warned against the alternating current developed by Tesla. And who was more competent to judge than Archimedes, in his time, Brahe in his, Galileo in his, and Edison in his?
* [Tesla was in fact a Serb who was born in the Croatian village of Smiljane in the Lika region, which at the time was part of Austrian monarchy. His father was an orthodox priest. Eds.]