Yeah, compasses are very delicate things and permanent magnets can ruin them quite easily, as you've just found out.
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but keep your compass once again close to the magnets and it will flip over again. Then check it outdoors to be sure it is directing north. It is just the tip of the needle that changed polarity.
but keep your compass once again close to the magnets and it will flip over again. Then check it outdoors to be sure it is directing north. It is just the tip of the needle that changed polarity.
And there's those phrases again, "it must be matched to the load" and "You must be at the top of this curve at the correct speed" (emphasis mine). 
Yes, I'm going to put my money where my mouth is, at least with five data points.
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