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Re: Making Flat secondaries - disaster #1...



Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" <Mddeming-at-aol-dot-com>

In a message dated 2/16/02 12:49:30 PM Eastern Standard Time, tesla-at-pupman-dot-com
writes:


>
> > The basic materials are all sound but the #24 wire could easily pull away
> > from the tape in large chunks.  The tape was no match at all for the
> > stiffness of the wire.
> >
> > "Next", I am thinking of using a second sheet of glass (I really worry
> > plastic will not be stiff enough) and spacing it at 21.5 mil to wind the
> > coil between the sheets.  I will probably have to glass drill a hole in
> the
> > sheets for the terminal and bolt to hold the sheets together.  Wow!!  I am
> > really looking forward to drilling the glass =:O)))  The winding will have
> > to be loose enough so as not to press against the sheets too much.  A tiny
> > bit of pressure from each wind could add up to a ton (maybe literally)
> when
> > 500 winds are in place.  One disadvantage of having the wire between
> sheets
> > is that I can't probe it for secondary voltage profiles.  Maybe not a big
> > deal since Paul's programs are real good :-))  I sort of wonder what
> effect
> > the coil holding forms will have on the coil...
> >
> > Cheers,
> >
> > Terry
> >



This could possibly be one reason why Tesla used #10 AWG wire for his big
spiral coils? ;-)  I note in Tesla's patents involving spiral coils that they
are shown schematically as oriented vertically for clarity of illustration.
There are also one or more posed photographs of him in front of a spiral coil,
for photographic effect. While there are many detailed cross-section and
working drawings of devices which were actually built and operated, Those that
went more or less directly from the concept to the patent office are shown only
in schematic form (for example, compare dwgs. for 609247 with those for 645576)
Does anyone know for certain whether he actually operated spiral coils oriented
vertically or horizontally or at what height above the ground, and was there
any special orientation to magnetic field of earth?  A large spiral in the
horizontal plane should have significant capacitive coupling to the earth
beneath it, and some of his coils were described as 8-! 10 ft in diameter.
         Tesla was fortunate in that all electromagnetic waves in his lab were
his own. In the early '60s, a guy in one of my electronics classes always got
strange results from work he did at home. Only after much investigation was it
finally realized that his was the first house east of the WERE transmitter
tower! EMI is a two-way street.
Matt D. 
G3-1085