Re: [TCML] Not an Oudin coil (was: Re: Single ear piglet)

["David Rieben" <drieben@xxxxxxxxxxx>]

Hi Aaron,

I suppose it's a matter of semantics as to how one defines
the term "Oudin" coil, these days. One of my reprints of the
old publication "High Frequency Aparratus" (circa 1916)
defined any single ended air cored transformer as a "Oudin
coil" and any double-ended air cored (bi-polar) transformer
as a "Tesla coil". However, a quick view of Wikipedia does
verify "your" definition ;^) Technically, it should be called a
"Oudin-D'Arsonval coil" since both Oudin and D'arsonval were
creditted with its invention. I think this term is rather archaic in
the modern day vernacular, anyway. :^)

David


----- Original Message ----- 
From: "J. Aaron Holmes" <jaholmes6502@xxxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Friday, April 24, 2009 1:25 PM
Subject: [TCML] Not an Oudin coil (was: Re: Single ear piglet)


> An Oudin coil is an autotransformer, yes?  Definitely not what you're 
> doing, David.  An Oudin coil with a one-eared pole pig for a primary 
> source would certainly be far, far greater *guaranteed* danger than a 
> similar Tesla coil with a primary/secondary arrangement.  An Oudin coil 
> with a one-eared pig means that you're standing on one leg of the primary 
> HV and the other is wired directly to the streamer that's about to hit 
> you.  With a Tesla coil, the concern for 50/60Hz on the streamers is 
> generally tied to the concern that a coincidental primary-to-secondary 
> flashover occurs, setting up a transient Oudin-coil-like scenario.  Still 
> not something to scoff at, but you do have to get [un]lucky.
>
> Regards,
> Aaron, N7OE
>
> --- On Thu, 4/23/09, David Rieben <drieben@xxxxxxxxxxx> wrote:
>
> > From: David Rieben <drieben@xxxxxxxxxxx>
> > Subject: Re: [TCML] Single ear piglet
> > To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> > Date: Thursday, April 23, 2009, 6:38 AM
> > Hi Jim,
> >
> >
> > Hmm, I'm not sure if I understand what you're asking?
> > First of all, yes, I suppose I am running it in the
> > classic
> > Oudin coil setup, as you describe. I think one of the
> > big "red flags" with this was that if one were to come in
> > contact with one of the streamers, it was tied into the
> > 60 hz primary currents and could prove a lethal shock
> > hazard. However, I think it's prertty well universally
> > undesrstood amongst the list membership by now that
> > you don't let 13 foot arcs hit your body under any cir-
> > cumstances, anyway. ;^)
>
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