Abstract
It is shown that Core and Distributed theories of the Earth's Magnetic Field predict different variations of field intensity with depth. Whereas on core theories both the horizontal and vertical intensities increase with depth according to an inverse cube law, on a distributed theory such as the one recently put forward by Blackett we find, with reasonable assumptions, that while the vertical intensity should increase for small depths as an inverse cube law, the horizontal intensity should decrease. The difference between the theories is even more marked deep inside the Earth. It is also suggested that if the variation with depth experiments gives a positive result in favour of distributed theories, then experiments on the magnetic effect of gorges in the Earth's surface might throw further light on the mechanism of the phenomena.
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