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From: ian field on 19 Feb 2010 16:54

"Oppie" <Oppie(a)saynotospam.com> wrote in message
news:oYAfn.4552$bx3.4399(a)newsfe13.iad...
> "life imitates life" <pasticcio(a)thebarattheendoftheuniverse.org> wrote in
> message news:d1qrn51tj2e00neuokoq3udjf6mt2ekm6s(a)4ax.com...
>>>Just to clarify-
>>>You mean don't touch the arc lamps? Don't think you meant anything
>>>against
>>>Bulbtronics. They've always done well by me.
>>
>>
>> I was talking about finger oils.
>
> Yes, touching the high temperature quartz envelope of Tungsten/Halogen or
> arc lamp capsules is a definite no-no. The oil on your skin get on the
> envelope and if not removed may cause the lamp to explode. The oil darkens
> from heat and UV, absorbs more heat locally and resulting imbalance of
> thermal stresses causes the envelope to burst. Particularly troublesome
> with Xenon lamps that are under about 10 atmospheres pressure at operating
> temperature. Even with the envelope cleaned after an accidental touch,
> I've seen finger prints etched into the surface.

Try dunking a lit halogen bulb (H4 etc) in a bowl of water and see what
happens.


From: Jim Thompson on 19 Feb 2010 17:17
On Fri, 19 Feb 2010 21:49:54 -0000, "ian field"
<gangprobing.alien(a)ntlworld.com> wrote:

>
>"Jim Thompson" <To-Email-Use-The-Envelope-Icon(a)My-Web-Site.com> wrote in
>message news:prqqn59dtop6le0uq0hmfd3uvk287p0id3(a)4ax.com...
>> On Thu, 18 Feb 2010 10:53:40 -0500, "Michael A. Terrell"
>> <mike.terrell(a)earthlink.net> wrote:
>>
>>>
>>>Jim Thompson wrote:
>>>>
>>>> On Wed, 17 Feb 2010 17:09:26 -0600, John Fields
>>>> <jfields(a)austininstruments.com> wrote:
>>>>
>>>> >On Wed, 17 Feb 2010 15:18:32 -0700, Jim Thompson
>>>> ><To-Email-Use-The-Envelope-Icon(a)My-Web-Site.com> wrote:
>>>> >
>>>> >>I'm having a senior moment (I'm entitled, 12 days to the big 7-0)...
>>>> >
>>>> >---
>>>> >Hmmm...
>>>> >
>>>> >I just did 72 on the 2nd, but I thought your next wasn't for a couple
>>>> >of
>>>> >years yet. ;)
>>>> >
>>>> >JF
>>>>
>>>> Time flies when you're having fun... DOB: 02/29/1940 (so I'm only 17.5
>>>> ;-)
>>>
>>>
>>> Why do you time flies? Sounds rather boring to me! ;-)
>>
>> Seems I'm on an express train... blink and I've missed a month ;-)
>
>Those are just the bouts of dementia.
>

Speaking for yourself, Ian ?:-)

...Jim Thompson
--
| James E.Thompson, CTO | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.
From: life imitates life on 20 Feb 2010 04:01
On Fri, 19 Feb 2010 21:49:54 -0000, "ian field"
<gangprobing.alien(a)ntlworld.com> wrote:

>
>"Jim Thompson" <To-Email-Use-The-Envelope-Icon(a)My-Web-Site.com> wrote in
>message news:prqqn59dtop6le0uq0hmfd3uvk287p0id3(a)4ax.com...
>> On Thu, 18 Feb 2010 10:53:40 -0500, "Michael A. Terrell"
>> <mike.terrell(a)earthlink.net> wrote:
>>
>>>
>>>Jim Thompson wrote:
>>>>
>>>> On Wed, 17 Feb 2010 17:09:26 -0600, John Fields
>>>> <jfields(a)austininstruments.com> wrote:
>>>>
>>>> >On Wed, 17 Feb 2010 15:18:32 -0700, Jim Thompson
>>>> ><To-Email-Use-The-Envelope-Icon(a)My-Web-Site.com> wrote:
>>>> >
>>>> >>I'm having a senior moment (I'm entitled, 12 days to the big 7-0)...
>>>> >
>>>> >---
>>>> >Hmmm...
>>>> >
>>>> >I just did 72 on the 2nd, but I thought your next wasn't for a couple
>>>> >of
>>>> >years yet. ;)
>>>> >
>>>> >JF
>>>>
>>>> Time flies when you're having fun... DOB: 02/29/1940 (so I'm only 17.5
>>>> ;-)
>>>
>>>
>>> Why do you time flies? Sounds rather boring to me! ;-)
>>
>> Seems I'm on an express train... blink and I've missed a month ;-)
>
>Those are just the bouts of dementia.
>
Yeah, it looks like that one zipped right over his head, eh?
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