GUSTOIMAGES / SCIENCE PHOTO LIBRARY GUSTOIMAGES / SCIENCE PHOTO LIBRARY
Magnetic compass. Man holding a magnetic compass in his outstretched hand. The compass has a free-swinging magnetic needle (red/black) pointing to a dial. The dial is graduated in degrees and shows the cardinal points: north (N), south (S), east (E) and west (W). 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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