Earth-currents are violent electrical disturbances of the nature of transient currents, which rush in one direction or the other, and by which telegraph lines, and particularly long submarine lines, were formerly constantly troubled. Their origin and nature are not thoroughly understood, but they are found to be very intimately connected with the perturbations of terrestrial magnetism called magnetic storms, and these, it is well known, are closely connected both with the appearance of the aurora borealis and with the occurrence of the sun's spots. Research Earth-Currents
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Matt and Leela Probert
Abbreviations
Research Earth-Currents
