Experiments with Alternate Currents of Very High Frequency and Their Application to Methods of Artificial Illumination

Here is one of Nikola Tesla's most important lectures; it brightened the world and everything in it.

Of all these phenomena the most important to study' are the current phenomena, on account of the already extensive and evergrowing use of currents for industrial purposes. It is now a century since the first practical source of current was produced, and, ever since, the phenomena which accompany the flow of currents have been diligently studied.