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Image: TeslaWirelessPower1891

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Description: Nikola Tesla demonstrating wireless transmission of power and high frequency energy at Columbia College, New York, in 1891. The two metal sheets were connected to his Tesla coil oscillator, which applied a high voltage oscillating at radio frequency. The electric field ionized the gas in the long partially-evacuated Geissler tubes he is holding (similar to modern neon lights), causing them to emit light without wires.
Title: TeslaWirelessPower1891
Credit: Nikola Tesla, "Experiments with alternate currents of very high frequency and their application to methods of artificial illumination" in Electrical World magazine, W. J. Johnson Co., New York, Vol. 18, No. 2, May 20, 1891, p. 19 Transferred from en.wikipedia to Commons.
Author: Nikola Tesla
Usage Terms: Public domain
License: Public domain
Attribution Required?: No

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