Abstract
In a paper by Dr. Adolph Schmidt, read before Section A of the British Association at Oxford (Report Brit. Assoc., 1894, p. 570), the author stated that he had expanded the components of the Earth's magnetic force in series, and had deduced expressions, two of which give the magnetic potential on the surface of the Earth in so far as it depends on (1) internal, and (2) external forces. “The third series represents that part of the magnetic forces which can not be expressed in terms of a potential, but must be due to electric currents traversing the Earth's surface.” The author concludes that such currents amount on the average to about 0.1 ampere per square kilometer.It appeared therefore desirable that this conclusion, drawn from the magnetic state of the Earth as a whole, should be tested by means of those portions which have been most fully studied.
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