Image: Magnetic isoclines India

Description: Magnetic isoclines in southern India c. 1838
Title: Magnetic isoclines India
Credit: (1839 https://archive.org/stream/madrasjournalli00esqgoog#page/n236/mode/2up/).+"Observations on the direction and intensity of the terrestrial magnetic force in southern India". The Madras Journal of Literature and Science 9: 221-273.
Author: T.G.Taylor and J. Caldecott
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