Goldspear

[Anonymous]

Sorry for the a bit off topic subject, but I know there are several gifted technical people on this board...
Does anyone know how the Goldspear works? If so can someone explain the theory of operation?
It sounds like an interesting instrument. I always wondered if it could be improved upon.
Thanks
Frank

 

[Anonymous]

Frank, I don't understand the technical basis for the Goldspear, other than it seems to be based on "contact potential". It's been around for some time now, and everything I've read or heard about it suggests that it is genuine technical apparatus that does what the manufacturer says it does.
There are probably patents on it which would reveal something about its operation.
--Dave J.

 

[Anonymous]

Hello Dave. I just got an e-mail from the guy that repairs the Goldspear. Here is his decription:
The Goldspear works in two ways. The very tip of the probe detects the
electrical charge that develops on a metal object. The probe tip is the
sensor for the black sand circuit. Magnetite, gold, silver, copper, etc.,
will detected by this tip due to their electrical charge. But the tip cannot
distinguish between the metals. The tungsten carbide laminate between the tip
and the probe shaft measure the conductivity of the metal. The laiminate(s)
is separated by a very thin insulator(s) and in effect act as a pair(s) of
probes on a meter. The electronics is configured to indicate when a piece of
metal is contacted by lighting one of three LEDs.

 

[Anonymous]

Thanks, Frank. What you describe is more or less what I thought it was, but didn't really know until your post. --Dave J.