A Brief History of Geomagnetism and a Catalog of the Collections of the National Museum of American History |
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19th century Academy Airborne Alexander Dallas Bache apparatus Barrow bibliography bifilar British Carnegie Institution catalog Coast Survey declination declinometer deflection designed dip circle dip needle Dover earth inductor earth's magnetic Edelmann Electricity Expedition Figure full citations Gambey Gauss and Weber Geodetic Survey geomagnetic Girard College Gulf Research Hansteen's History of Geomagnetism horizontal intensity Humboldt improvement inclination inclinometer India Survey inductor instru isogonic Kew Observatory Kew type Lamont Lloyd Lloyd-Creak London Magnetic and Meteorological magnetic compass magnetic field magnetic force magnetic instruments magnetic intensity Magnetic Needle Magnetic Observatory magnetic poles magnetic survey magnetograph magnetometer measure ment minutes of arc Museum of American National Museum netic netometer North Paris present collection Reference Report Royal Society Sabine Sciences scientific servatory Smithsonian Contributions Smithsonian Institution Survey's telescope Terrestrial Magnetism theodolite total intensity Transactions U.S. Naval unifilar magnetometer United USC&GS variation Variometers vertical force magnetometer volume Washington