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    Re: Test your magnetic compass.
    From: Michael Bradley
    Date: 2012 Nov 18, 14:42 -0800

    Sorry Bill

    ...A couple more power engineer / physicist ideas to tip into the pot....

    For one:
    Heavy power lines can be a concentric construction of copper, aluminium, and steel. Even with nil current, it must be possible
    that the pemeability of the steel power lines along a 'suitable' bearing could deflect the earth's magnetic field locally.

    For two:
    Blythe innocents assume that the current in an alternating supply cable must
    be symmetrical about zero. Please be assured that it isn't always so - there can be all sorts of asymmetrical and non linear loads connected. In particular, common magnetic loads with saturating magnetic components are not entirely linear and symmetrical. Ditto electronic loads.

    Enjoy ....

    55 North

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