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insulators, resonance...


>> Electrical energy conducted thru the earth dissipates 
>> rapidly.  Sea water is not bad.  Pure water/fresh water is lossy.  
>> Resistance of "soil" varies all over the lot.  (pun.  ha.)  Its relatively 
>> easy to	measure the resistance of any patch of soil.

>Studies and theories of earth resonances and lightning model
	Yep.  Model.  As used means "simplify reality to the point wwe can deal
	with it"  Modesl are not all powerful.  Case in point:  The aerodynamic
	model that sez the bumblebee can't fly.  The bumblebee ignores the
	model and flys anyway....  Modesl are powerful tools, but they have
	their limitations...

>the earth as a large, negatively charged, perfectly conducting
	Yep..   Thast the way they model it.  But it isn't.  Depending on where
	The reistance is good or bad, low or high.

>sphere or surface covered by a thin dielectric layer (the atmosphere up to
>about 30 mi.), followed by another conducting layer (the ionosphere);
>essentially a giant capacitor
	Yep.  A giant capacitor with one resitivep plate.

>(btw - the earth's "fair weather" field is on the order of 100V/m, during a
>thunderstorm this rises to  10kV/m or more).   The "resistance" of any
>particular cubic meter of soil doesn't play much  of a role in the earth
>resonances that Tesla envisioned (that incidentally have been experimentally
>demonstrated - Schuman resonances I think? - by showing that the the atmosphere
>can be used as a lossless waveguide). 
	Yep.  I know all that.  Schuman resonances.  There are lotsa kinds of
	resonances.  Good ones (high Q) and bad ones (low q) lossy plates
	in that cap are gonna give low q resonance.

>As for the electrical energy dissipating, electricity can be viewed as a 
>non-compressible fluid (remember Kirchoff's current law; what goes in 
>has to come out).
	Electric CURRENT can be so viewed.  Electric POWER requires voltage and
	current.  What happens if the current flows on, or in a lossy earth
	(the only kind ther is) is that the power is gradually dissipated.

>And if the earth does indeed act as a perfectly conducting
	We know it is not.

>insulated sphere,
	Yep.

>then what Tesla was talking about would seem to make sense.
	Even if it is imperfectly conducting, the resonance might well be seen
	(is seen, if the experimets are correct....)

>Tesla even attempted to calculate the frequencies that the earth would
>resonate at just by using the above assumptions, and he came real close to the
>actual measured values. 
	The losses would not so much affect the value of the frequency as the
	Q, or sharpness of the resonance.  What the losses would do is make any
	ground current portion of  wireless power scheme lossy... 

=====================================
	The mesurements are not easy.  I listend to a description of one such
set, at the second ITS Con.  They were working with good equipment, in a lab
"near" WAshington DC.  They had good equipment, looking at Mag field.  Over a
period of weeks, they eliminated one noise source after another.  Finally they
thought they had it down to "real" signals.  But they were supsicios of two:
	25 Hz and another, i ferget.  May have been 30.0 or 15.0.  I think
	the exactitude of it made them suspicious.  (there is no reason a global
	resonance should be on an exact frequency in human derived units....)
	They finally found that by killing the air conditioning system it went
	away. Something about the movement of the sheet metal in the air ducts.

	They were still puzzled by the 25H.0z.  So i told them to think about
	the AMTRAK NEC which runs trains to Washington on 25Hz.  They seemed
	interested...

	regards
	dwp