Actually this could likely be achieved by suspending a coil in free air by threads, and energising via a long fine needle-point from an ionising HV generator.
This plasma-bridge consists of two plasma-antenna's (1 sending and 1 receiving) to convey longitudinal electricity.
Which reminds me that I still have not told where you can find the clue in his Colorado Spring Notes, that Tesla was indeed planning on using this.
It is Nov. 23 1899, that he measures the capacitance of various vacuum tubes without any explanation why he is doing so. He has at this point completed all other experiments that were necessary to find the Wardenclyffe parameters. This is the last bit of information that he was needing. He gives no reason but he states: "Note: All of these tubes developed rays fairly strong while tested". This indicates that he was also measuring radiation (longitudinal electricity).
So, he was interested it their capacitance and radiation, this fits perfectly in the 'rare notes' as top load of the free system. And the drawing in the 'pre-hearing interview' shows the use of identical sending and receiving antenna's...
In the before mentioned video, Eric Dollard shows this exact arrangement, which provides what I consider 'the final proof'.
Ernst.
BTW, anyone still having problems with the images? I tried various versions of Linux/Firefox, I even tested with a windows machine (don't tell anyone ), I have no problem seeing the images whatsoever.
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