Compiled in 1894 with Tesla’s cooperation, Thomas Commerford Martin’s The Inventions, Researches and Writings of Nikola Tesla is the master document of Tesla’s golden decade: the polyphase system that electrified the world, the high-frequency researches, the lectures, and the patents, gathered while the work was still warm.
For Tesla at full technical depth — not myth, but the actual engineering — this is the source. Download the free EPUB and read the record that made the legend.