Compass of variation. 16th century engraving showing a compass of variation. This was used to measure the difference between true north and magnetic north at any given point. True north could be found from the celestial observations. This engraving was first published in The Navigator's Supply by William Barlowe,printed at London in 1597 | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Middle Temple Library |
Bildgröße: | 5304 px × 3444 px |
Modell-Rechte: | nicht erforderlich |
Restrictions: | - |