(CyberSpaceOrbit.com) "Some years ago, a friend who was the best authority on Tesla apparatus in my part of the world, disclosed to me, reluctantly, that he had constructed a small unusual shape toroidal former wound with wire in a equally unusual manner. Imagine a doughnut shape basket squashed in on the sides so as to form a slot in the center rather than a hole.
Wire was wound from the slot area and the winding progressing up and around the out side surface of the 'doughnut', and finally back up in the slot area. Also there were some turns of wire circulating within this 'basket'.
Now this fellow had attached a H.F. transmitter to the device along with high voltage DC. He claimed that when he switched power to the coil, the room he was in seemed to be shrinking in toward the coil. Needless to say that it frightened the daylights out of him."