RE: home grown plasma globe

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Mark Dunn" <mdunn@xxxxxxxxxxxx>


Mike:

I have not tried pure Xenon, but I believe you are correct.  Note the
color on late model luxury car automobile headlamps.  As I understand
it, those are pure Xenon bulbs.

Mark

-----Original Message-----
From: Tesla list [mailto:tesla@xxxxxxxxxx]
Sent: Tuesday, October 18, 2005 12:29 AM
To: tesla@xxxxxxxxxx
Subject: Re: home grown plasma globe


Original poster: "Mike" <mike.marcum@xxxxxxxxxxxx>

so pure xenon would be all whitish blue (more on the blue side with
higher power)?

Mike
----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Monday, October 17, 2005 2:33 PM
Subject: RE: home grown plasma globe


>Original poster: "Mark Dunn" <mdunn@xxxxxxxxxxxx>
>
>
>Ed:
>
>Sorry, I'm a little late on this.  Got behind on "list" e-mails.
>
>I have found -20 to -22 " Hg to give the best effect.
>Mixture target was 90% Neon, 5% Xenon, 5% Krypton.
>
>See our Globes at www.TeslaBoys.com
>
>Our gas control for filling is rudimentary.
>After building two blue balls I thought I had the method down to a
>science. The 3rd and 4th turned out green, and the 5th blue again.
>
>All were "loaded" in what I thought was an identical method. Obviously,

>the color is very sensitive to the ratio of Xenon/Krypton.
>
>This method gives a pink color all around the periphery of the
>ball(from the Neon). The streamers turned out blue or green(from the
>Krypton/Xenon mix?).
>
>In both cases placing your hand on the ball gives a blue/white streamer

>clearly caused by the Xenon.
>
>Used an air conditioning compressor as a vacuum pump and a manifold
>with a bunch of valves. Pumped down to full vaccuum then admitted a
>fixed volume of gas at a fixed pressure based on PV=nRT to reach the
>goals.
>
>Purchased gas in 10 liter bottles(small propane torch size) from
>www.specgasinc.com Neon $30, Krypton $45, Xenon $60.  Of course,
>shipping to boot.  Make sure to ask for a valve(CGA-600).  It adapts
>the std propane type connection to 1/4" npt and has a built in needle
>valve.
>
>Note:  I did the pressure testing with Argon and found the best result
>that way and used that as my target for the other gases.
>
>I have not tried a lot of gas combinations because I got lucky early in

>my trials.  There may be other better combinations.
>
>Mark
>
>
>
>-----Original Message-----
>From: Tesla list [mailto:tesla@xxxxxxxxxx]
>Sent: Sunday, October 09, 2005 3:11 PM
>To: tesla@xxxxxxxxxx
>Subject: Re: home grown plasma globe
>
>
>Original poster: Ed Phillips <evp@xxxxxxxxxxx>
>
>"gas mix and pressure is very important as to what kind of display you
>will get, a (very)low pressure system will give you more wispy
>streamers as to where a higher pressure( still near vacuum) will give
>you more lightning bolt effects. "
>
>Does anyone have any good "recipes" on the topic to share with us?  I'd

>be very much interested.
>
>Ed
>
>