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Glass Caps


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From:  gweaver [SMTP:gweaver-at-earthlink-dot-net]
Sent:  Monday, January 26, 1998 9:08 AM
To:  Tesla List
Subject:  Re: Glass Caps

I used glass plate caps for years and when I switched to rolled poly oil
caps my output sparks length doubled.  I had a lot of problems with the
glass breaking when it got hot.  I could run a glass cap at 15K 90ma for 30
second runs and let it cool for 10 minutes and it was fine.  If I ran the
cap for 60 seconds the glass would break.  I was using 24" x 25" tempered
safety glass .150 thickness which is more sensitive to uneven temperature
than float glass or plate glass.  Running the same glass on a smaller cap
and smaller power supply 15K 30 ma I could run the TC for several minutes
with out breaking any glass.  I never tried putting any of my glass caps in oil.

Gary Weaver



At 05:54 AM 1/26/98 -0600, you wrote:
>
>----------
>From:  Jean-Marc Patten [SMTP:jp001-at-mail.orion-dot-org]
>Sent:  Sunday, January 25, 1998 3:21 PM
>To:  Tesla List
>Subject:  Re: Glass Caps
>
>I built one using 1/4 inch window glass.
>
>W= Glass
>m-Mylar
>AL= AL foil
>
>
>
>  WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW        <-1/4 Window glass 12x20 inch
>mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm     <-was 0.01 inch Mylar 
>mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm
>mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm
>    AL-------------------------AL          <-was 10x6 inch AL foil 
>mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm
>mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm
>mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm
>  WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW
>This is just 1 part we stacked 8
>and connected them like normal.
>we ran 10KV -at-30ma
>
>
>
>
>On Sun, 25 Jan 1998, Tesla List wrote:
>
>> 
>> ----------
>> From:  Gregory R. Hunter [SMTP:ghunter-at-mail.enterprise-dot-net]
>> Sent:  Sunday, January 25, 1998 9:19 AM
>> To:  Tesla List
>> Subject:  Glass Caps
>> 
>> Dear Readers,
>> 
>> Anyone ever run a medium or large coil with a glass cap?  I'm trying 
>> to figure out how bad the heating problem is at 1KVA and up.  I've 
>> only built 3 small coils, all under 500VA.  All I've ever used is 
>> glass caps, and I've only experienced one unexplained failure in a 
>> foil & window glass cap on a 380VA coil.  A hasty autopsy revealed 
>> glass panes laced with very fine, spider web-like cracks.  Might've 
>> been due to thermal effects.  My current 450VA coil runs with salt 
>> water bottle caps.  I think the water sinks so much heat, I'll never 
>> be able to detect RF heating at such low power input levels.
>> 
>> Greg
>> 
>> 
>> 
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