Interval counting binary code seismic prospecting system

Claim 1

APPARATUS FOR SEISMIC PROSPECTING, COMPRISING: A FIRST ELECTRICAL CODE GENERATOR FOR PRODUCING AN ELECTRICAL SIGNAL HAVING A CHARACTERISTIC VARIABLE IN ACCORDANCE WITH A PSEUDO-RANDOM CODE, RESPONSIVE TO AN ACTUATING SIGNAL; AN ELECTRO-SEISMIC WAVE TRANSDUCER AT A TRANSMITTING LOCATION COUPLED TO SAID CODE GENERATOR FOR INJECTING A SEISMIC SIGNAL INTO THE EARTH WHICH IS VARIABLE IN ACCORDANCE WITH VARIATIONS IN THE OUTPUT SIGNAL OF SAID CODE GENERATOR; A SECOND ELECTRICAL CODE GENERATOR FOR PRODUCING AN OUTPUT SIGNAL IDENTICAL TO THE OUTPUT SIGNAL PRODUCED BY SAID FIRST CODE GENERATOR, RESPONSIVE TO AN ACTUATING SIGNAL COUPLED THERETO; SEISMIC WAVE DETECTING MEANS AT A REMOTE LOCATION FROM SAID TRANSMITTING LOCATION FOR PRODUCING AN ELECTRICAL OUTPUT SIGNAL VARIABLE IN ACCORDANCE WITH VARIATIONS IN SEISMIC WAVES DETECTED THEREBY; CROSS-CORRELATING MEANS ELECTRICALLY COUPLED TO SAID SECOND CODE GENERATOR AND TO SAID SEISMIC WAVE DETECTING MEANS FOR PRODUCING AN OUTPUT SIGNAL INDICATIVE OF THE CORRELATION BETWEEN THE OUTPUT SIGNALS OF SAID SECOND CODE GENERATOR AND SAID SEISMIC WAVE DETECTING MEANS;