Before revision: Their construction usually featured a disruptive discharge coil with an interrupter to apply a high voltage, high frequency, low current to the human body for therapeutic purposes.. Overview Their basic construction was invented prior to 1900 by Nikola Tesla, who introduced his first prototypes at the World's Columbian Exposition in 1893.
After revision: Their construction usually featured a disruptive discharge coil with an interrupter to apply a high voltage, high frequency, low current to the human body for therapeutic purposes.. Overview Their basic construction was invented before 1900 by Nikola Tesla, who introduced his first prototypes at the World's Columbian Exposition in 1893.