Tesla Coil was often compared to Thomas Edison. Tesla Coil was invented by Nikola Telsa it was his ideas that eventually overcame the limitations of DC power; Mr. Vale mentioned that Edison probably stuck by his belief of DC power though he secretly knew that Tesla was correct in supporting AC power.
Around 1891 Tesla created the Tesla coil, which is used to produce high voltages of electricity. A Tesla coil is a type of resonant transformer circuit and is used to produce high voltage, low current, high frequency alternating currency electricity. Mr. Vale used a Tesla coil to illuminate various bulbs and rods, and even had a long wooden stick with a metal end and a light bulb in the middle that he held over the voltage without getting shocked.
The Tesla Coil was loud. Tesla mentioned back in the day that he would like to see one in every household, however the device is simply just too loud. 