Re: Strange shock (fwd)

["Barton B. Anderson" <tesla123-at-pacbell-dot-net> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)]

Hi David, 

I read this after replying to David's post. Since you observed the same
phenomenon with a cardboard form, then I would think that the coating applied
is probably the cause. I still think PVC and similar forms may cause this
problem, but also the coating type. The charge properties of your shellack may
be very different than the Marine Spar Varnish I used. I've ran my coil in
relative humidity levels down to 20, but never got a shock. I have a habbit of
touching the secondary after runs checking for a static charge and have never
had one on the coil. 

Bart 

Tesla list wrote: 
>
> Original poster: "Ed Phillips" <evp-at-pacbell-dot-net> 
>
> Tesla list wrote: 
> > 
> > Original poster: Tesla729-at-cs-dot-com 
> > 
> > Hi all, 
> > 
> > I've been observing all of these different comments regarding the obvious 
> > electrostatic phenomena of the sec. coil surface and there is really little
>
> > that I can add. I have indeed experienced this effect myself in the past a 
> > few times and it does seem like, to the best of my knowledge, that it al- 
> > ways involved plastic PVC pipe as the secondary form material. With my 
> > very limited formal education in physics, 
>
>         I've seen a very pronounced example of this in a coil wound on a 
>  3-1/8" cardboard mailing tube, shellacked and dried a couple of times, 
> and then with a couple of coats of shellack over the winding of #28 wire 
> (wire size shouldn't matter, of course}.  On a dry day the "shocks" can 
> be observed at least 15 minutes after the thing has been run. 
>
> Ed