> Personally I would start with a piece of copper 1/2" water pipe, work
out
> from theoretical resistance of copper how far apart the tap points
should
> be, and solder a couple of wires on and give it a try.

A piece of #12 wire will be easier to deal with, and the much smaller
outer diameter will make it easier to compute the expected resistance.
Computing the resistance of a hollow tube between two point connections to
the outside of the tube is not a trivial matter.


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