"When a coil is operated with currents of very high frequency, beautiful brush effects may be produced, even if the coil be of comparatively small dimensions. The experimenter may vary them in many ways, and, if it were nothing else, they afford a pleasing sight."
Nikola Tesla was a Serbian-American inventor and electrical engineer known for his work on alternating current power systems. His inventions and patents helped shape modern electrical transmission and industrial power use.