Tesla in 1885, at age twenty-nine, shortly after his arrival in the United States.
The high-voltage high frequency current is being passed through the human body to bring the lamp to incandescence. Mr. Samuel Clemens (Mark Twain) is holding the loop over the resonating coil.
Robert Underwood Johnson holding a loop with an incandescent lamp. Tesla is in the background at the switch.
Mark Twain and Joseph (“Jo”) Jefferson in Tesla's South Fifth Avenue laboratory, 1894, with blurred image of Tesla between.
Tesla holding a gas-filled phosphor coated wireless light bulb which he developed in the 1890's, half a century before fluorescent lamps come into use.
Tesla holds a highly evacuated, gas-filled tube, powered by one of his high-frequency oscillator units. The one-amp tube operated without any connection to wires (“wireless energy”)
Tesla's body, in this experiment, is charged to a high potential by means of a coil responsive to the waves transmitted to it from a distant oscillator.
Tesla demonstrates “wireless” power transmission in his Houston Street laboratory in March 1899.
Tesla sits in front of the oscillator in a second exposure.
"The scientific man does not aim at an immediate result. He does not expect that his advanced ideas will be readily taken up. His work is like that of the planter — for the future. His duty is to lay the foundation for those who are to come, and point the way. He lives and labors and hopes."
— Nikola Tesla