Julius Erasmus Hilgard - Projects

Projects

One of the projects on which J.E. Hilgard worked, on behalf of the Smithsonian Institution and the Coast Survey, was the construction of a self-recording magnetometer of United States manufacture based on the design of Charles Brooke, and described in a 1860 report to the Smithsonian Institution. The significance of self-recording magnetometers, as they relate to geomagnetic storms was not fully understood until the late Twentieth Century and is not referenced in any of the Ninetieth Century biographies of J.E. Hilgard. In 1859, the self-recording magnetometer at the Smithsonian Institution may have been only the second such device in operation, the original one being under the management of Balfour Stewart at the Kew Observatory in London. Unlike the instruments at the Kew Observatory, it is unlikely that the instruments at the Smithsonian were in continuous operation during any part of 1859. Alexander Dallas Bache was the Superintendent of the Coast Survey at the time and sponsored many studies pertaining to terrestrial magnetism. Records show that Bache was in regular correspondence with the Royal Society and even coordinated magnetic surveys of North America with them.

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