Seismic record computer or profile plotter

Claim 1

IN APPARATUS FOR CORRECTING A PLURALITY OF SEISMIC SIGNALS REPRODUCIBLY RECORDED ON A FIRST RECORD TO PRODUCE A CORRECTED RECORD OF SAID SIGNALS WITH SIGNIFICANT FEATURES THEREOF DIFFERENTLY POSITIONED ON SAID CORRECTED RECORD, INCLUDING, A FRAME MEMBER, A FIRST RECORD DRUM ROTATABLY MOUNTED ON SAID FRAME MEMBER AND ADAPTED TO CARRY SAID FIRST RECORD, A DETECTING TRANSDUCER MOUNTED ON SAID FRAME MEMBER ADJACENT SAID FIRST RECORD DRUM AND ADAPTED TO DETECT SAID SEISMIC SIGNALS, A CORRECTED RECORD DRUM ROTATABLY MOUNTED ON SAID FRAME MEMBER AND COUPLED TO SAID FIRST RECORD DRUM FOR ROTATION THEREWITH, SAID CORRECTED RECORD DRUM BEING ADAPTED TO CARRY SAID CORRECTED RECORD, A RECORDING TRANSDUCER MOUNTED ON SAID FRAME MEMBER ADJACENT SAID CORRECTED RECORD DRUM AND ADAPTED TO RECEIVE SAID DETECTED SEISMIC SIGNALS FROM SAID DETECTING TRANSDUCER AND RECORD SAID SEISMIC SIGNALS, MEANS FOR ROTATING SAID FIRST RECORD DRUM AND SAID CORRECTED RECORD DRUM AND A VOLTAGE SOURCE: THE IMPROVEMENT COMPRISING SUPPORT MEANS CARRYING ONE OF SAID TRANSDUCERS AND MOVABLY MOUNTED ON SAID FRAME MEMBER TO PERMIT MOVEMENT OF SAID ONE TRANSDUCER IN A DIRECTION PARALLEL TO THE DIRECTION OF ROTATION OF THE COMPLEMENTARY ONE OF SAID DRUM AND RELATIVE TO A REFERENCE POSITION ON SAID FRAME MEMBER; ELECTRICAL COMMAND MEANS CONNECTED TO SAID