Re: [TCML] tcml primary self c

["DC Cox" <resonance@xxxxxxxxxxxx>]

No myth here --- I am sticking to the facts. Physics is physics and it
doesn't change.

If you look at some photos of Wysock's earlier coils using copper ribbon you
see a generous amount of corona off the sharp edges.

I also experienced this in photos I shot.

My advise is:  if you are running a coil with ribbon shoot your own photos
and check for corona.  Make your own determination.  But, if you are
designing from scratch, why not use good engineering practice in the first
place?

Anytime you run a coil at 200-400 kV (or more) and put a sharp edge near the
secondary (12-24" away), it will definitely produce corona.  Just do the
physics or look at some electrostatic plots of ribbon coils and you will see
what I mean.

I urge future coil builders to use copper tubing --- it's rounded edges help
retard corona.  A better solution than burying your head in the sand and
pretend the corona doesn't exist.

Dr. Resonance

On Mon, Jul 28, 2008 at 6:39 PM, <dr.hankenstein@xxxxxxxxxxxxx> wrote:

> I agree with Finn. Here is a long time exposure taken at 1600ASA of a small
> coil with a flat ribbon primary:
> http://www.audiotesla.org/images/Corona%20Experiment/DSC_0155.JPG  I don't
> see any evidence of the ribbon causing corona worth worrying about. I am
> using "high voltage buss" on my larger coil. The difference between high
> voltage buss and low voltage buss is that the corners are rounded on the HV
> buss to help reduce the effects of corona when the buss is in close
> proximity of each other. Over 69kv the buss is usually round and the edges
> are all smoothed down.
>
> Woo
>
>
> > [Original Message]
> > From: Finn Hammer <f-h@xxxx>
> > To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
> > Date: 7/28/2008 5:23:25 AM
> > Subject: Re: [TCML] tcml primary self c
> >
> > DC Cox skrev:
> > > After I saw all the corona in B&W asa 400 photos I shot with 4-8 sec
> > > exposure time,
> > Even posting this picture would not add much credit to your point of
> > view. Pictures taken with the same film, and exposure times, of similar
> > sized tubular coils excited by the same primary bang energy would have
> > to be produced.
> > Then a long term study of the effects on the secondary (Which I have
> > already done) would also have to be produced
> > >  I realized the sec coil would be slowly degraded using sharp
> > > edged copper ribbon and quit this procedure.
> > >
> > Oh, so you _assumed_, in the stead of actually _observed_, that a
> > degradation would take place.
> >
> > A lot of newbies are listening. Let`s stick to facts instead of adding
> > to the list of coiling myths, shall we? Doc?
> >
> > Cheers, Finn Hammer
> >
> >
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