"R.Wieser" wrote:
> but because the need for DC -
> not influencing magnetic compasses - overruled the cost for it.

You're confusing me here. AC may make a needle tremble a bit in spite of
being dampened but has no effect on the averge field. DC current on the
other hand, even if coaxial or otherwise partially shielded, can make
the weak terrestrial field go completely haywire.

Are you sure about your facts?

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