Method of and apparatus for generating seismic waves

Claim 1

AN APPARATUS FOR GENERATING SEISMIC WAVES COMPRISING AN ANCHOR ADAPTED TO BE PLACED IN A HOLE IN THE EARTH AND TO BE IMMOVABLY SECURED THEREIN, A PLATE HAVING AN OPENING EXTENDING THERETHROUGH, SAID PLATE BEING DISPOSED WITH THE AXIS OF SAID OPENING GENERALLY CO-AXIAL WITH THE AXIS OF THE HOLE AND BEING POSITIONED WITH ONE OF ITS FLAT SURFACES IN FACE-TO-FACE CONTACT WITH THE SURFACE OF THE EARTH SURROUNDING THE HOLE, AND MEANS SUPPORTED ON SAID PLATE CONNECTING SAID PLATE WITH SAID ANCHOR THROUGH SAID OPENING IN SAID PLATE AND EFFECTIVE TO REPEATEDLY EXERT CLOSELY SPACED SUCCESSIVE FORCES CAUSING SAID ANCHOR AND SAID PLATE TO BE MOVED IN THE DIRECTION OF ONE ANOTHER SO AS TO PLACE THE EARTH BENEATH SAID PLATE REPETITIVELY IN COMPRESSION, SAID MEANS COMPRISING A HYDRAULIC CYLINDER SUPPORTED BY SAID PLATE AND HAVING A PISTON CONNECTED TO SAID ANCHOR THROUGH SAID OPENING, A SERVO VALVE CONTROLLING THE FLOW OF FLUID UNDER PRESSURE TO SAID HYDRAULIC CYLINDER, A SERVO PILOT FOR CONTROLLING THE OPERATION OF SAID SERVO VALVE, SAID SERVO PILOT BEING RESPONSIVE TO A SIGNAL SUPPLIED THERETO TO CAUSE A SERIES OF CLOSELY SPACED CONSECUTIVE ACTUATIONS OF SAID SERVO VALVE AT THE FREQUENCY OF THE SIGNAL, A MOTOR DRIVEN PUMP ADAPTED TO PLACE FLUID IN THE SYSTEM UNDER PRESSURE, A HIGH PRESSURE ACCUMULATOR, MEANS PROVIDING FLUID COMMUNICATION BETWEEN THE DISCHARGE OF SAID PUMP AND SAID HIGH PRESSURE ACCUMULATOR AND SAID SERVO VALVE, AND MEANS PROVIDING COMMUNICATION BETWEEN THE EXHAUST PORT OF SAID HYDRALIC CYLINDER AND THE INLET OF SAID PUMP.

Claim 2

AN APPARATUS FOR GENERATING SEISMIC WAVES COMPRISING AN ANCHOR ADAPTED TO BE PLACED IN A HOLE IN THE EARTH AND TO BE IMMOVABLY SECURED THEREIN, A PLATE HAVING AN OPENING EXTENDING THERETHROUGH, SAID PLATE BEING DISPOSED WITH THE AXIS OF SAID OPENING GENERALLY CO-AXIAL WITH THE AXIS OF THE HOLE AND BEING POSITIONED WITH ONE OF ITS FLAT SURFACES IN FACE-TO-FACE CONTACT WITH THE SURFACE OF THE EARTH SURROUNDING THE HOLE, AND MEANS SUPPORTED ON SAID PLATE CONNECTING SAID PLATE WITH SAID ANCHOR THROUGH SAID OPENING IN SAID PLATE AND EFFECTIVE TO REPEATEDLY EXERT CLOSELY SPACED SUCCESSIVE FORCES CAUSING SAID ANCHOR AND SAID PLATE TO BE MOVED IN THE DIRECTION OF ONE ANOTHER SO AS TO PLACE THE EARTH BENEATH SAID PLATE REPETITIVELY IN COMPRESSION, SAID MEANS COMPRISING A HYDRAULIC CYLINDER SUPPORTED BY SAID PLATE AND HAVING A PISTON CONNECTED TO SAID ANCHOR THROUGH SAID OPENING, A SERVO VALVE CONTROLLING THE FLOW OF FLUID UNDER PRESSURE TO SAID HYDRAULIC CYLINDER, A SERVO PILOT FOR CONTROLLING THE OPERATION OF SAID SERVO VALVE, SAID SERVO PILOT BEING RESPONSIVE TO A SIGNAL SUPPLIED THERETO TO CAUSE A SERIES OF CLOSELY SPACED CONSECUTIVE ACTUATIONS OF SAID SERVO VALVE AT THE FREQUENCY OF THE SIGNAL, A MOTOR DRIVEN PUMP ADAPTED TO PLACE FLUID IN THE SYSTEM UNDER PRESSURE, A HIGH PRESSURE ACCUMULATOR, MEANS PROVIDING FLUID COMMUNICATION BETWEEN THE DISCHARGE OF SAID PUMP AND SAID HIGH PRESSURE ACCUMULATOR AND SAID SERVO VALVE, AND MEANS PROVIDING COMMUNICATION BETWEEN THE EXHAUST PORT OF SAID HYDRALIC CYLINDER AND THE INLET OF SAID PUMP.