Re: Beading caught on film.

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Mike" <induction@xxxxxxxxxxx>

Hi Gerry,
               Interesting. I wonder if that is electrode material 
sputtering off?
I took another look at the model plane and it has about the same hot area
near it's tip of the arc. I also see there is a space, corona blue, between the
contact point and where the bright area begins. It would be cool to shoot
spectra and compare this hot zone to the rest of the discharge.
Maybe others will have some idea of what is going on in that end and bright 
spot.
I'm going to see what I can do to get the Phantom high speed camera MIT has
for a better look. Maybe you could ask your local university for the same, of
course they have to take the shots. Then you use a Cine format viewer. It takes
a T1000 LAN interface card but they can record it then dump it to you or 
burn a CD.
Mike



----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Wednesday, May 04, 2005 11:31 PM
Subject: Re: Beading caught on film.


> Original poster: "Gerald  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>
>
> Hi Mike,
>
> The coil was a classical spark gap (either static SG or SRSG) TC powered 
> from NST's.  The phenominum occured at 500W and 1KW power levels (and 
> using a smaller coil as well).  I can draw a 5 foot arc and there would be 
> a 3 or 4 inch segment of the arc close to but not touching the grounded 
> strike point that would be about twice as bright as the rest of the arc. 
> The position of the segment would not change from one streamer to another.
>
> Gerry R
>
>
> > Original poster: "Mike" <induction@xxxxxxxxxxx>
> >
> > Hi Gerry,
> >              Interesting arc related question. I've read that with DC 
> > welding in certain systems, the cathode runs something like 1/3 hot 
> > compared to the anode, at 2/3 hot. Current direction flow issue I guess.
> > I know if I draw an arc in the discharge tube, even 6 feet long, I can 
> > get the Stainless base to show Blue staining when I access it again but 
> > never see this in the top electrode. The top is usually negative, the 
> > base is usually positive and grounded.
> > Do you notice this in DC only?
> > Mike
> >
> >
> > > Original poster: "Gerald  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>
> > >
> > > Hi Terry,
> > >
> > > I think it is a picture just before you burned your house down :-)) 
> > > Seriously, when I draw a power arc to a grounded object,  there always 
> > > seems to be a segment of the arc near the grounded object that is twice 
> > > as bright as the rest of the arc.  Any ideas on what that might be and 
> > > could this be the same phenominum???    What are beads (in the airplane 
> > > picture)???  I havent heard this term before.
> > >
> > > Gerry