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A vertical string of casing becomes magnetized by induction under the influence of the terrestrial magnetic field. For theoretical investigation we may treat such a casing as a bar magnet having an exaggerated ratio of length to diameter. Formulae are derived, based on the fundamental law of Coulomb, to express the anomalous components of the magnetic elements in different horizontal planes and at different radial distances from the casing head. Curves representing these equations are shown. Graphical illustrations of the composition of these anomalous components and the normal components of the earth's magnetizing field are included, together with typical experimental data obtained in the field.
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