English: Experiment in wireless power transmission by inventor Nikola Tesla at his Colorado Springs, USA laboratory in December 1900. The light glowing near the bottom is powered by energy transmitted wirelessly from the huge million volt, 300,000 watt magnifying transmitter in his lab nearby. The grounded "receiver" coil shown is tuned to resonance with the transmitter coil, and the lamp is powered by three turns of wire inductively coupled to the coil at bottom. The Century magazine article containing this picture does not say how far away the transmitter is.
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Caption: Fig 4. EXPERIMENT TO ILLUSTRATE THE TRANSMISSION OF ELECTRICAL ENERGY THROUGH THE EARTH WITHOUT WIRE. The coil shown in the photograph has its lower end or terminal connected to the ground, and is exactly attuned to the vibrations of a distant electrical oscillator. The lamp lighted is in an independent wire loop, energized by induction from the coil excited by the electrical vibrations transmitted to it through the ground from the oscillator, which is worked only to five per cent. of its full capacity.
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Downloaded from . First published in Nikola Tesla, , Century Magazine, The Century Co., New York, June 1900, fig. 4. Also appears in Nikola Tesla, Aleksandar Marinčić 1978 , Nikola Tesla Museum, Beograd, Serbia, fig. 25
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Photo was taken by Dickenson V. Alley, photographer at the Century Magazines
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Un esperimento a Colorado Springs dove una bobina collegata a terra e sintonizzata è in risonanza con una trasmittente distante; la lampadina accesa vicino al fondo è alimentata dal trasmettitore. @Alfio
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{{Information |Description= Colorado Springs experiment where grounded tuned coil is in resonance with distant transmitter; Light is glowing near the bottom. |Source=http://en.wikipedia.org/wiki/Image:TeslaWirelessIllustration.png |Date=08.01.2008 |Author