Illustration of a declination compass or declinometer. The compass was used to measure the angle between the geographic and magnetic poles of the Earth. Image published in Physique Populaire (Emile Desbaux, 1891). | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Collection Abecasis |
Taille de l’image : | 2955 px × 3272 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |