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Magnetism Reference library
... ( 1729 , 1744 ), the VOC captain Nicolaas van Ewyk ( 1752 ), the English cartographer Samuel Dunn ( 1775 ), the German-Swiss natural philosopher Johann Heinrich Lambert ( 1777 ), the French astronomer Pierre Charles Le Monnier ( 1778 ), and the English surveyor James Rennell ( 1798 ). The first world chart depicting isoclinics (lines of equal dip) was published by the Swedish physicist Johann Karl Wilcke in 1768 , primarily based upon inclinations observed at sea by the French abbot Nicolas-Louis de la Caille ( 1750–1754 ) and Karl Gustav...