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.
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.
Detta verk är också upphovsrättsfritt i länder och områden där upphovsrätten förfaller70 år eller färre efter upphovsmannens död.
Du måste även inkludera en tagg för allmän egendom i USA för att indikera varför detta verk är allmän egendom i USA. Observera att i en del länder förfaller upphovsrätten senare än efter 70 år: Mexiko har 100 år, Jamaica har 95 år, Colombia har 80 år, samt Guatemala och Samoa har 75 år. Denna bild kanske inte är allmän egendom i dessa länder, som också inte uppfyller regeln om kortare sikt.
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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
{{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