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Re: sparks

As I mentioned some time ago, depending on the material and the polish
of it, even a blunt object can create large fields because metal
whiskers can elevate from the plan of the surface. This is a common mode
of arc initiation.



On Tue, 20 Feb 2001,
brian whatcott wrote:

At 12:47 2/20/01 -0500, you wrote:
Does the difference imply anything about which is best
- the pointed vs. round lightning rod?

| Robert Cohen

Hehehe...perhaps not - but I find it rather misleading
to compute a breakdown value for an electric field using
point electrodes.
Points produce high fields, so the appropriate electrode
is flat or almost flat to provide the asymptotic value.

brian whatcott <> Altus OK