smooth sphere vs unsmooth sphere

To: "'Tesla List'" <tesla-at-pupman-dot-com>
Subject: smooth sphere vs unsmooth sphere
From: Tesla List <tesla-at-stic-dot-net>
Date: Thu, 2 Apr 1998 22:38:20 -0600
Approved: tesla-at-stic-dot-net


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From:  Sulaiman Abdullah [SMTP:sulabd-at-hotmail-dot-com]
Sent:  Friday, April 03, 1998 3:48 AM
To:  tesla-at-pupman-dot-com
Subject:  Re: smooth sphere vs unsmooth sphere


>From:  Bert Hickman [SMTP:bert.hickman-at-aquila-dot-com]
>Sent:  Friday, March 27, 1998 8:22 AM
>To:  Tesla List
>Subject:  Re: smooth sphere vs unsmooth sphere
>
>Tesla List wrote:
>> 
>> ----------
>> From:  Sulaiman Abdullah [SMTP:sulabd-at-hotmail-dot-com]
>> Sent:  Thursday, March 26, 1998 10:25 AM
>> To:  tesla-at-pupman-dot-com
>> Subject:  Re: smooth sphere vs unsmooth sphere
>> 
>> Tristan,
>> You can estimate the voltage produced by your coil now.
>> VOLTAGE = 2.83 MV x R         (R = radius in meters)
>> I just worked this formula out today based on a commonly accepted 
value
>> of 25 micro-coulombs per square meter being the limit before 
breakout.
>> 
><SNIP>
>
>Sulaiman
>
>Where'd you find the 25 uC/square meter figure? Was this for DC?
>
>Thanks!
>
>-- Bert --
>
Yes, this rersult is near enough to a similar 'rule of thumb' which 
gives 3 kV / mm whether in a 'gap' or at the edge of a sphere.
 V = 2.83 Mv x R  (R = radius of sphere in meters) ... comments?