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Originally Posted by FrankM
I have posed that question to some of my correspondents whether "field mills" would be suitable for detecting the differences in the electric potential at the surface over voids.
Anytime you run a wire from the surface into an underground cavity it will disrupt the natural field, thus battery operated devices would have to be used to measure and record information. As noted in my previous post, there are few reports on the subject of measuring potential differences over underground voids.
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I searched 'field mill' as I didn't know that device & I found plans for building one.
http://www.precisionstrobe.com/jc/fi...fieldmill.html
I have a small multimeter & I thought one lead grounded & the other as an
aerial? Just thinking out loud. I will look over the field mill plans & description in more detail. Thanks as always Frank.
