Diagram of the Earth's magnetic field. Engraving showing the dip of the Earth's magnetic field at various latitudes,after the work of William Gilbert (1540-1603). In this picture,line AB is the equator,C is the North Magnetic Pole (Arctic) and D the South Magnetic Pole (Antarctic). The tip of the arrows are magnetic south,and the direction of the arrows indicates the direction a freely-rotating compass would point. To test the hypothesis,Gilbert used a special round lodestone called a terrela | |
Licence : | Droits gérés |
Crédit: | Science Photo Library |
Taille de l’image : | 4488 px × 4031 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |