**Date:** Wed, 27 Mar 2002 07:32:24 -0500

**Author:** Chuck Britton

**Subject:** Re: Safety of Van de Graaff Generators

**Post:**

and just to confuse things a bit more - - -

The length of the spark should be measured between FLAT

parallel plates.

Curvature of either electrode will skew this 'estimate' of voltage

toward a higher than actual value.

At 10:01 PM +1000 on 3/27/02, David Eric Bailey wrote

>I have worked for years using a breakdown potential for air (dry?) of

>15KV/cm to estimate the potential of my VDGs. and I certainly cannot recall

>my source for this figure . Karl has quoted a value of 8KV/cm which is

>somewhat(!) lower.

>

>> Perhaps it can be judged by arc length of the discharge in air,

>>>given that its about 8KV/cm of discharge.

>>>

>Can someone supply a confirmation of either/neither figure or source where a

>reasonable value for the voltage can be obtained ? Ta.

>

>>

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