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Tesla's invention is very different though, but the closest thing to it in conventional technology is in photovoltaics.One radical difference is that conventional solar-electric panels consist of a substrate coated with crystalline silicon; the latest use amorphous silicon.The cream product I use to cure it works very well, but its active ingredient appears to be urea.
When the New York Times in June of 1902 carried a story about an inventor who claimed he had invented an electrical generator that did not require a prime mover in the form of an external fuel supply, Tesla wrote a friend that he had already invented such a device.
The third one, (as described in detail in Science & Mechanics magazine, Spring, 1980), requires critical sizes, shapes, orientations, and spacings of magnets, but no feedback. The opposite terminal of the condenser being connected to ground, which may be considered as a vast reservoir of negative electricity, a feeble current flows continuously into the condenser and inasmuch as the particles are charged to a very high potential, this charging of the condenser can continue almost indefinitely, even to the point of rupturing the dielectric.
Such a motor could drive an electric generator or reversible heat pump in one's home, year round, for free. Today, we would call this device a solar-electric panel.
While in college Tesla thought it could be possible to operate an electrical motor without sparking brushes.
He was told by the professor that such a motor would require perpetual motion and was therefore impossible. In the 1880's, despite his professors scoffs, Tesla patented the alternating current generator, motor, and transformer.