. Deep borehole surveys and problems. Boring. GEOPHYSICAL METHODS OF INVESTIGATING 227 where at right angles to the current Hnes, so that if the spacial distribution of the current Hnes is determined in any manner the equipotential planes are also located. These current lines have the construction of an ellipsoid of many shells, Fig. 153 being a hemispherical section for the current. Fig. 154.—Horizontal section through the equipotential lines. lines between two electrodes in a homogeneous under- ground. In many cases the ore body itself also generates a polarization current in its surrounding

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. Deep borehole surveys and problems. Boring. GEOPHYSICAL METHODS OF INVESTIGATING 227 where at right angles to the current Hnes, so that if the spacial distribution of the current Hnes is determined in any manner the equipotential planes are also located. These current lines have the construction of an ellipsoid of many shells, Fig. 153 being a hemispherical section for the current. Fig. 154.—Horizontal section through the equipotential lines. lines between two electrodes in a homogeneous under- ground. In many cases the ore body itself also generates a polarization current in its surroundings. The distribu- tion of the current in a body depends upon the form and. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Haddock, M. H. (Marshall Henry). New York, McGraw-Hill

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