Universal Earth-Currents and Their Local Characteristics
Memoirs of Kakioka Magnetic Observatory, Supplementary, Vol. 1, pp.
1-76, May, 1957
INTRODUCTION
So-called absolute values of earth-current potentials, which are meant by the potential differences themselves measured by some suitable method and apparatus between two points on the earth's surface, generally consist of various kinds 0f potentials due to different causes and circumstances in different localities, but generally speaking, tbey can be divided into two parts; the one is caused by some agencies prevailing in the higer atomsphere of the earth, while the other by ones seated in the earth including a number of extraneous effects near the electrodes.
APPENDIX
THE MEASUREMENT OF EARTH-CURRENT POTENTIATLS AND ITS RELAIABILITY
§1. Introduction
Superficially the method of the earth-current measurement is simplicity itself and does not differ in principle from an ordinary physical measurement of potential difference in the first kind or second kind of conductor. We must, however, take seriously into considerations following some characteristic points in these fields of science.
