LXX. The experimental determination of the geomagnetic radial variation

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Abstract
Theories of the origin of the dipole components of the Earth's main magnetic field are of two types; distributed theories attribute it to a fundamental property of rotating matter, core theories to current systems within the core. The variation with depth below the surface of the horizontal field intensity is different for the two theories. Experimental values are given for this variation, obtained by measurements in coal mines, which are near to the values predicted by a core theory, and significantly different from those predicted by a distributed theory. The magnetic effects of the sedimentary rocks and magnetic anomalies due to the basement rocks are shown to have negligible results on the measurements.

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