RE: Capping secondary coil forms

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Michael Quarles by way of Terry Fritz <twftesla-at-qwest-dot-net>" <mquarles-at-qusion-dot-com>

I am new to this and I have not made a coil yet.  When I first saw that
people were capping the secondary, I wondered about heat.  Does the seconday
ever get warm?
If you cap both ends, would this cause a problem with the expanding air
trapped inside the seconday?  What about just capping the top?

But like I said I am new.  Maybe there is no heat at all.  I don't know.


 > -----Original Message-----
 > From: Tesla list [mailto:tesla-at-pupman-dot-com]
 > Sent: Tuesday, December 17, 2002 12:00 PM
 > To: tesla-at-pupman-dot-com
 > Subject: Capping secondary coil forms
 >
 >
 > Original poster: "Gregory Peters by way of Terry Fritz
 > <twftesla-at-qwest-dot-net>" <s371034-at-student.uq.edu.au>
 >
 > Hello all,
 >
 > All these years I have been capping my secondary forms with
 > plexiglas/acyrlic or lexan/polycarbonate discs. This apparently
 > prevents arcs down the centre of the secondary. I have never
 > questioned this theory until now. I just made a new secondary and
 > really couldn't be bothered capping it, though I eventually did
 > anyway. But I really think that if the toroid is large enough, arcing
 > inside the form wouldn't happen anyway. I've noticed that arcs never
 > seem to leave the centre of the toroid, supporting my theory. Is this
 > just another theory that stems from the days of doorknob discharge
 > terminals? Anyone out there running uncapped coils with outputs that
 > vastly exceed the winding length?
 >
 > Cheers,
 >
 > Greg.
 >
 >
 >