Method and apparatus for analysis of seismographic records

Claim 1

IN VIBRATION WAVE ANALYSIS OF A PLURALITY OF TRACES ON A STRIP NUMBER REPRODUCIBLE FORM, SAID TRACES BEING MADE BY THE RESPONSES OF RECEPTORS AT A PLURALITY OF POINTS DIFFERENTLY LOCATED RELATIVE TO A COMMON SOURCE OF DISTURBANCE SUCH THAT THERE IS PHASE-TIME DIFFERENCE BETWEEN THE SEPARATED TRACES, APPARATUS FOR CONTINUOUSLY DETERMINING THE AMOUNT OF TIME CORRECTION REQUIRED TO BRING EACH SEPARATE AND INDIVIDUAL TRACE INTO PHASE-TIME COINCIDENCE WITH A REFERENCE TRACE CORRESPONDING TO THE OUTPUT OF A RECEPTOR LOCATED AT A SELECTED REFERENCE POINT WHICH COMPRISES MEANS FOR PRODUCING A VOLTAGE OUTPUT PROPORTIONAL TO THE TIME REQUIRED FOR A REFLECTED SOUND WAVE TO REACH THE RECEPTOR AT THE REFERENCE POINT, MEANS FOR PRODUCING A SEPARATE VOLTAGE OUTPUT PROPORTIONAL THE TIME REQUIRED FOR A REFLECTED SOUND WAVE TO REACH A RECEPTOR SPACED FROMTHE REFERENCE POINT, AND MEANS PLACING SAID VOLTAGE OUTPUTS IN SERIES OPPOSING, THEREBY OBTAINING A RESULTANT VOLTAGE OUTPUT INDICATIVE OF THE MAGNITUDE OF SAID TIME CORRECTION.