Abstract
Geophysical methods of prospecting may be divided into two groups of a different character, as indicated in Tables 1 and 2. The first group comprises methods (for example, gravitational) by which direct effects of subterranean inhomogeneities are observed. The second group consists of procedures (for example, seismic, magnetic, radioactive, and electric) whereby artificial fields of force are produced and their distortion by subterranean bodies of different physical properties is measured. This paper is to discuss briefly the magnetic, the radioactive, and the electric methods of prospecting.
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