In reply to John Winterflood's message of Thu, 25 Oct 2007 14:54:55 +0800: Hi, [snip] >Robin van Spaandonk wrote: > > ... Note that Tesla lit light bulbs 25 miles away, with no wires, > > using only the ground as common medium. ... > >As I understand it there were two conductors - the earth and the >ionosphere. The ionosphere was coupled to capacitively using a tall >mast and high frequency and voltage oscillations. There may have been >some ionospheric resonance involved also, but the whole process is not >something that is really known about and AFAIK has never been done since.
I suspect that the large sphere on top of the mast was not "coupled to the ionosphere" (how?). I think it was simply a large doorknob capacitor that was raised on a tower to ensure that it was well insulated from ground. Regards, Robin van Spaandonk The shrub is a plant.
