Electron writes:
> Won't the return currents cause ionization in the terrain, etc.. possibil=
y
> with biological implications?

	I just red the pdf on the link and it did say that the
return currents were around 1200 meters down. I know that
alternating current is successfully used in meggers which are
magneto-based ohm meters for measuring soil conductivity. I
don't know what would happen over a long period of current flow
but as long as there is not a DC component, the continuous
reversal seems to prevent ionization.

	Neon and fluorescent lamps last much longer running on
AC than they do on DC. Also, some en clinometers use an
electrolyte in a sealed tube and they can be damaged by DC but
work fine on AC.

Martin McCormick
WB5AGZ
--=20
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