Patent Document ID: 4467283
Application ID: 06304916
Patent Flag: 1

Claim One:
1. An electrical geophysical exploration system comprising: a source of electric current; a single conductor cable connected to the output of said current source, said cable having a plurality of longitudinally spaced connection points extending along the surface of the earth; a plurality of probe means for coupling current into the earth; a plurality of addressable switching units, each of said switching units being connected between one of said connection points along said cable and one of said probe means, each of said switching units being responsive to a unique address signal to temporarily electrically interconnect its associated connection point and probe means; means, coupled to said cable, for providing a series of address signals on said single conductor cable to sequentially activate said switching units, whereby current from said source is connected individually through said switching units to said probe means in a predetermined sequence; and means for measuring the resultant electrical signals generated by said probe means and conducted through the earth at locations along the surface of the earth spaced from said probe means.