Re: Secondary Construction

On Wed, 4 Oct 1995 tesla-at-grendel.objinc-dot-com wrote:

> >From MALCOLM-at-directorate.wnp.ac.nz Wed Oct  4 14:43 MDT 1995
> >Received: from ns-1.csn-dot-net (root-at-ns-1.csn-dot-net []) by uucp-1.csn-dot-net (8.6.12/8.6.12) with SMTP id OAA09332 for <tesla-at-grendel.objinc-dot-com>; Wed, 4 Oct 1995 14:33:08 -0600
> From: "Malcolm Watts" <MALCOLM-at-directorate.wnp.ac.nz>
> To: tesla-at-grendel.objinc-dot-com
> Date:          Thu, 5 Oct 1995 09:31:34 +1200
> Subject:       Re: Secondary Construction
> Hi Stan...
> > > > 
> MW> > Point taken, but...
> MW> > Can anyone explain why sparks would prefer to travel down the 
> MW> >inside of the former (winding) rather than the outside ?
> > > 
> SH> thppppppth! Oh, sorry, had to dust off some neurons. I'd guess 
> SH> that the magnetic flux density tends to be greater inside the 
> SH> secondary, and without the added dielectric of the end caps, arc 
> SH> form more easily.
> Thanks for the reply. I am of course aware of the behaviour of
> plasmas in magnetic fields (a la Tokamaks, solar prominences, auroras
> etc.). The reason I ask is because there is a well known photograph
> of one of the MASTER's large coils (in a building) clearly throwing
> sparks twice its height, yet without a plastic former, no sparks in-
> ternally. The coil is clearly effectively suspended in air.
> Malcolm

Yes Malcolm, thats a good point! Tesla threw sparks much bigger than the 
secondary on his coils and these were open wood forms! Might have 
something to do with the space winding?