Author:
Edmond Halley (1656-1742)
Contour maps showing curves of equal value (an isogonic map, lines of equal magnetic declination for the world, possibly the first contour map of a data-based variable)
Mediaitems:
National maritime museum, Halley magnetic chart, Halley isogonic map, Halley biography, Geomagnetism: early concept of the North Magnetic Pole
Category:
Statistics & Graphics