Electric Discharge in Vacuum Tubes

Nikola Tesla was a Serbian American inventor, electrical engineer, mechanical engineer, physicist, and futurist best known for his contributions to the design of the modern alternating current (AC) electricity supply system. 

 Nikola Tesla was a man of letters. He wrote many letters to the editors of the magazines and newspapers of his day. These letters give a fascinating glimpse into the mind of an eccentric genius. The subject matter ranges widely, as Tesla was interested in almost everything. In these letters he responds to Marconi and Edison, gives his thoughts on the wars of his day, corrects inconsistencies in news reports, and much much more. Nikola Tesla has been called the most important man of the 20th Century. Without Tesla's ground-breaking work we'd all be sitting in the dark without even a radio to listen to.