It has been proposed by S. H. Ward (1959) and C. S. Wright et al. (1960) that nonuniformity in the earth's crust will tend to tilt the direction of the fluctuating components of the geomagnetic field from its normal horizontal direction. In fact, Ward and colleagues have developed a practical scheme (AFMAG) for geophysical prospecting which makes use of this phenomenon in the frequency range from 100 to 400 c/s. Sir Charles Wright et al., on the other hand, have found that at much lower frequencies, .005 to 1 c/s, a substantial verticalcomponent of the field in the vicinity of coast lines or other situations where the earth's crust departs from horizontal stratification.

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