File:Collected reprints - Atlantic Oceanographic and Meteorological Laboratories (and) Pacific Oceanographic Laboratories (1968) (20639608486).jpg

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Title: Collected reprints / Atlantic Oceanographic and Meteorological Laboratories (and) Pacific Oceanographic Laboratories
Identifier: collectedreprin1972v2atla (find matches)
Year: 1968 (1960s)
Authors: Atlantic Oceanographic and Meteorological Laboratories; Pacific Oceanographic Laboratories; United States. Environmental Science Services Administration. Research Laboratories; Environmental Research Laboratories (U. S. )
Subjects: Oceanography Periodicals.
Publisher: Washington, D. C. : U. S. Dept. of Commerce, Environmental Science Services Administration, Research Laboratories : For sale by Supt. of Docs. U. S. G. P. O.
Contributing Library: Penn State University
Digitizing Sponsor: LYRASIS Members and Sloan Foundation

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Figure 19. Lines of force of the earth's magnetic field are aligned as if generated by an internal bar magnet. DN and DS are the north and south geomagnetic poles; NP and SP are the geographical north and south poles. (Arthur Holmes, PRINCIPLES OF PHYSICAL GEOLOGY, Second Edition, The Ronald Press Company, New York, fig. 726. Copyright 1965). of iron-rich minerals with magnetic properties, especially the mineral magnetite present in many volcanic rocks. Quartz, limestone, rock salt, and most sediments have very low magnetic susceptibilities. The perma- nent intensity is recorded in the materials from exposure to previous magnetic fields which have varied in the past. Magnetic intensity measurements of the continental shelf are made with a magnetometer towed either by a ship or an airplane. The compo- nents of a magnetometer are the sensing element towed on an electrical cable, electronic components to convert the output of the sensor into units corresponding to magnetic intensity (gammas; 1 gamma = 10-5 gauss), and a recorder to display the values. Two types of magnetometers in common usage are the fluxgate and the proton free-precession (fig. 18) . 783

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