The remanent magnetometer, sturdily constructed for use in a mobile field laboratory, is capable of measuring magnetic moments of rocks as small as 2×10−8 c.g.s. unit per cc. A sample of rock of 25- to 50-cc volume is rotated over a pick-up coil at 10 cycles per second, and the induced alternating voltage, after amplification, is measured in both intensity and phase, and the direction and intensity of magnetization determined. The apparatus is calibrated with a needle-magnet of known magnetic moment. It has been used successfully in measurements of polarization of the glacial clays of New England and sedimentary rocks of the western states.
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Johnson et al. (1949) studied this question.
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