Almost every modern plasma therapy system stems from the work by Nikola Tesla in the years from 1884 to after 1900. Tesla invented the plasma globe that is popular as a household display.  Tesla also invented the AC generator that is the heart of all power generating plants today. Below is a stunning example of the powerful (pardon the pun) work he did.

Above is a multiple exposure picture of Tesla sitting next to his magnifying transmitter that is generating millions of volts. The 7-metre (23 ft) long arcs were not part of the normal operation, but only produced for effect by rapidly cycling the power switch.

For more on Nikola Tesla go here – Nikola Tesla