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Magnetic compass. The compass has a free-swinging magnetised needle (purple and white) pointing to a dial. The dial is graduated in degrees and shows the cardinal points: north (N), south (S), east (E) and west (W). Only N and W are seen here. The needle aligns itself with the local lines of magnetic force to indicate the direction of the north (shown by the purple end) and south (shown by the white end) magnetic poles.
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