"This coil.. .shown in my patents Nos. 645,576 and 649,621, in the form of a spiral, was, as you see, in the form of a cone...in an inductive coupling which was not close —we call it now a loose coupling - but free to permit a great resonant rise. That was the first single step, as I say, toward the evolution of an invention which I have called my 'magnifying transmitter.' That means, a circuit connected to ground and to the antenna, of a tremendous electromagnetic momentum and small damping factor, with all the conditions so determined that an immense accumulation of electrical energy can take place." - Nikola Tesla (Nikola Tesla on His Work with Alternating Currents, Leland Andersen, Editor, Sun Publishing, 1992, p. 72)
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