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Geophysical Surveying Using Magnetics Methods …
EBS 309 : Geofizik Carigali Magnetik Dr. Kamar Shah Ariffin Page 1 of 35 Geophysical Surveying Using Magnetics Methods Introduction Introduction to magnetic Exploration - Historical Overview Unlike the gravitational observations described in the previous section, man has been systematically observing the earth's magnetic field for almost 500 years. Sir William Gilbert (left) published the first scientific treatise on the earth's magnetic field entitled De magnete. In this work, Gilbert showed that the reason compass needles point toward the earth's north pole is because the earth itself appears to behave as a large magnet. Gilbert also showed that the earth's magnetic field is roughly equivalent to that which would be generated by a bar magnet located at the center of the earth and oriented along the earth's rotational axis.
EBS 309 : Geofizik Carigali Magnetik Dr. Kamar Shah Ariffin Page 1 of 35
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