Wilcke word map

WORLD MAP. MAGNETIC INCLINATION MAP. WILCKE, JOHAN CARL (1732-1796). Försök til en magnetisk inclinations charta. N.d. (1768). Engraved map, about 325x450. Uncut as issued. Wilcke, Swedish phycisist, the first to publish a magnetic inclination map of the world in 1768, published in the transactions of the Swedish Academy of Science.