Re: Semi-OT: Plasma globes - type of glass?

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Thomas Coyle" <zxcasd@xxxxxxxxx>

Thanks, Mark - I was thinking it would most likely be boro. As for the
fix, I got such a good deal on it that I'll probably try to fix it
myself - I understand the risks and dangers, but I'm in this for the
fun and experience - if I wanted to pay someone to do it, I just would
have bought one that wasn't broken. :) I'll be sure to be wearing my
body armor and safety goggles when I work on it. :)

Thanks again!

Tom

On 4/27/07, Tesla list <tesla@xxxxxxxxxx> wrote:
> Original poster: "Mark R Dunn" <teslamark@xxxxxxxxxxxxx>
>
>
> Thomas:
>
> It's likely Borosilicate(ie Pyrex).  Sounds like the fill tube is broken.
> The fix is not trivial and needs to be performed by an expert glass-blower.
> Otherwise you risk breaking the globe due to differential expansion of the
> glass by uneven heating.
>
> Mark
>
>
>
> -----Original Message-----
> From: Tesla list [mailto:tesla@xxxxxxxxxx]
> Sent: Friday, April 27, 2007 10:56 PM
> To: tesla@xxxxxxxxxx
> Subject: Semi-OT: Plasma globes - type of glass?
>
> Original poster: "Thomas Coyle" <zxcasd@xxxxxxxxx>
>
> Does anyone have any idea what type of glass is generally used in
> plasma globes? I have a relatively large globe (around 14" diameter)
> that I bought on Ebay a year or so ago, and I'm about to have some
> time to start playing with it. The catch is that it's broken on the
> base. I've toyed with glasswork and shouldn't have any problem fixing
> it, as long as I can pick a glass with the same or near-same
> coefficient of thermal expansion (COE). Any suggestions?