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The Department of Terrestrial Magnetism was established by the Carnegie Institution of Washington in 1904 expressly to investigate the magnetic field of the earth and its variation, both over space and over time. This site focuses on the ocean surveys of the Department which measured the magnetic field in the world’s oceans on ten voyages over a period of nearly 25 years in the early 20th Century. Two vessels were employed in this investigation, first the Galilee, then the custom-built Carnegie.  

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