Few people realize that Nikola Tesla was one of the pioneers of X-ray. Experimenting with Crookes tubes (a kind of glass bubble with two electrodes sunk, from which the air was pumped out) connected to a high voltage source, he observed the emission of penetrating radiation invisible to the human eye. These experiments were carried out regardless of similar attempts by the German physicist Wilhelm Roentgen, widely recognized as the discoverer of X rays, which are a type of high-energy electromagnetic radiation.
Disc turbine
In 1913, Tesla patented a bladeless disc turbine - it was the hundredth American patent obtained by a scholar. The device consisted of a set of metal shields placed close to each other. These discs were set in motion by a liquid under pressure, moving in the spaces between them.
The list of Tesla patents also includes numerous improvements to existing devices. The inventor was mainly concerned with electricity. He experimented with various methods of its production and distribution, worked on improving existing electric motors or light sources. At the same occasion, he did not shy absent from additional challenge - afterward in his life he became paying attention in aviation skill, obtain even a patent for a kind of aircraft ready with a set of movable propellers to enable vertical take-off and landing