TEK IMAGE / SCIENCE PHOTO LIBRARY TEK IMAGE / SCIENCE PHOTO LIBRARY
Magnetic compass. The compass has a free-swinging magnetised needle (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 and south magnetic poles.
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