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IF the tube is sensitive to the vertical field component, it would be optimized for that component (geographic north pole to south pole) coming upward from the bottom of the tube towards the top, as it does in the northern hemisphere. So, if you mount it vertically, you will get the same polarity by putting the top of the tube to the south, I think. And maybe it won't be enough of an effect to be out of range of adjustment. Degaussing will be important, of course.
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