Quadrantal Deviation
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The error caused by the difference of the induced magnetism in thwartships and fore-and-aft horizontal iron in the ship. This error is corrected by two iron balls attached one on each side of the binnacle bowl.
The error caused by the difference of the induced magnetism in thwartships and fore-and-aft horizontal iron in the ship. This error is corrected by two iron balls attached one on each side of the binnacle bowl.