Magnetic chart of the Atlantic. Chart of the Atlantic Ocean showing variations in compass readings,originally published in 1700 (see E056/0100) by the English astronomer,meteorologist and physicist Edmond Halley (1656-1742) and here updated and reissued after 1744. In 1698 and 1699 Halley,most famous for his work on comets,was given command of a ship by King George III and told to record geographical variations in compass readings (the amount the horizontal alignment of the needle differs from geographical North) as a way for sailors to determine longitude. The lines,known as isogonic lines,show places where the magnetic variation is equal | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / NEW YORK PUBLIC LIBRARY / The Lionel Pincus and Princess Firyal Map Division / Stephen A. Schwarzman Building |
Bildgröße: | 5079 px × 4138 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |