Re: Capping secondary coil forms

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

Original poster: "Brian by way of Terry Fritz <twftesla-at-qwest-dot-net>" <ka1bbg-at-webryders-dot-net>

Hi, my #3 coil has 2 secondary's i can use either one, one is 14 inches
long, the other 18 inches long. Both made from 3.5 inch white pcv, open both
ends, I have photographic evidence of 42 inch sparks..right on John Freau's
formula for length. I have a bunch of secondary's from other coils i built,
one even still has the dirt inside from being out in the weather laying on
the ground..all of my secondary's are open. cul brian f.


----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Tuesday, December 17, 2002 3:00 PM
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.
 >
 >
 >