Prospecting for gold with electricity
 

Old long range ore locator for good conductive materials in the 20's.

Longer Version : http://books.google.de/books?id=zSkD...esult#PPA26,M1

I hope this Link works...

Yes, I have complete version, but for the rights implicated can't post all! :)

Old Friend Built this
 

Back in late 1950s a friend of mine built one of those. He said an old guy came buy and gave him the specs. The old guy showed my friend ore samples from gold veins he had found with the LRL

I ask him how it worked and the explanation was the two large coils mounted on the tripod detected anomalies in earth currents. The metal veins cause the earth current deviations. That is about all I remember from that long ago.
Goldfinder