Re: tungsten anyone? (Thoriated vs straight tungsten)

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: G Hunter <dogbrain_39560@xxxxxxxxx>

In vacuum tubes, the addition of 1.5% Thorium to the
tungsten cathode can increase electron emission by
1000 times.

Welding electrodes with 1-3% Thorium added will strike
and maintain an arc more easily than pure Tungsten,
and the arc is also more stable.

Apparently, Thorium greatly increases electron
emission and current carrying capacity of hot
Tungsten. I'm only guessing, but perhaps a Thoriated
Tungsten TC spark gap would have a lower arc
resistance as compared to a pure Tungsten spark gap?
In a real-world, hobby-type TC system, it's hard to
believe it would matter that much.

Greg

--- Tesla list <tesla@xxxxxxxxxx> wrote:

> Original poster: "huil888" <huil888@xxxxxxxxxxxx>
>
> Tony -
>
> Exactly what "increased electrical properties" does
> thoriated
> tungsten offer, relative to "straight" tungsten?
>
> Regards,
> Scott Hanson
> ----- Original Message ----- From: "Tesla list"
> <tesla@xxxxxxxxxx>
> To: <tesla@xxxxxxxxxx>
> Sent: Friday, February 09, 2007 6:58 PM
> Subject: RE: tungsten anyone?
>
>
> >Original poster: "Anthony R. Mollner"
> <penny831@xxxxxxxxxxxxx>
> >
> >Thoriated rods are better because of their
> increased electrical properties.
> >Hopefully the ones you are getting have that in
> them.
> >Tony
> >
> >-----Original Message-----
> >From: Tesla list [mailto:tesla@xxxxxxxxxx]
> >Sent: Thursday, February 08, 2007 8:26 PM
> >To: tesla@xxxxxxxxxx
> >Subject: Re: tungsten anyone?
> >
> >
> >Original poster: "Joe Smith"
> <proffessor@xxxxxxxxxxx>
> >
> >Hi Mike ,,Great Idea!!
> >
> >I would be interested in 10 pieces ,,,1/2" diameter
> by 1 and 1/2" inch
> >long,,
> >thats pure tungsten??? (I hope:>))
> >regards
> >Joe.
> >
> >
> >
> >On Wed, 07 Feb 2007 18:18:59 -0700, "Tesla list"
> <tesla@xxxxxxxxxx>
> >said:
> >  > Original poster: Mike <megavolts61@xxxxxxxxx>
> >  >
> >  > Hi all,
> >  >     I've been conversing in email with a sales
> rep from diamond
> >  > ground products about tungsten for spark gaps.
> It occurred to me
> >  > that maybe some on the list would be interested
> in getting some and I
> >  > thought I'd ask and see if there was sufficient
> interest in
> >  > organizing a bulk buy.  They apparently have
> them in sizes all the
> >  > way up to 1 1/2 inch diameter.
> >  > Mike
> >  >
> >  >
> >  >
> >  > 8:00? 8:25? 8:40?
> >  >
>
<http://tools.search.yahoo.com/shortcuts/?fr=oni_on_mail>Find
> a flick
> >  > in no time
> >  > with
> >  >
>
the<http://tools.search.yahoo.com/shortcuts/?fr=oni_on_mail>Yahoo!
> >  > Search movie showtime shortcut.
> >  >
> >  >
> >--
> >    Joe Smith
> >    proffessor@xxxxxxxxxxx
> >
> >--
> >http://www.fastmail.fm - Access all of your
> messages and folders
> >                            wherever you are
> >
> >
>
>
>
>
>




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