Telluric current method of determining ellipse area by simultaneously measuring two voltages with a collinear three electrode array

Claim 1

A TELLURIC CURRENT PROSPECTING METHOD FOR DETERMINING THE RELATIVE ELLIPSE AREA OF SELECTED LOCATIONS IN A SURVEY LINE ACROSS THE EARTH''S SURFACE COMPRISING THE STEPS OF: (A) MEASURING AS A CONTINUOUS FUNCTION OF TIME A FIRST VOLTAGE BETWEEN ONE END ELECTRODE AND THE MIDDLE ELECTRODE OF A COLLINEAR THREE ELECTRODE ARRAY, SIMULTANEOUSLY MEASURING AS A CONTINUOUS FUNCTION OF TIME A SECOND VOLTAGE BETWEEN SAID MIDDLE ELECTRODE AND THE OTHER END ELECTRODE OF SAID COLLINEAR THREE ELECTRODE ARRAY; (B) DETERMINING THE VOLTAGE CHANGE IN SAID FIRST VOLTAGE DURING A PLURALITY OF INTERVALS OF TIME DURING THE MEASUREMENT OF SAID FIRST VOLTAGE; (C) DETERMINING THE CHANGE IN SAID SECOND VOLTAGE DURING EACH OF THE SAME INTERVALS OF TIME; (D) CORRELATING THE CHANGE IN SAID FIRST AND SAID SECOND VOLTAGE DURING EACH OF SAID INTERVALS OF TIME TO DERIVE A RATIO BETWEEN THE CHANGES IN SAID TWO VOLTAGES FOR EACH OF SAID INTERVALS OF TIME; (E) AND DETERMINING THE LIMIT BETWEEN WHICH LIMIT AND UNITY SAID RATIOS CLUSTER, SAID LIMIT BEING NUMERICALLY EQUAL TO SAID SOUGHT RELATIVE ELLIPSE AREA.