Seismometer

Claim 1

AN APPARATUS FOR USE IN SEISMIC GEOPHYSICAL EXPLORATION COMPRISING A CUP-SHAPED CASING, A MAGNET ASSEMBLY COMPRISING A PERMANENT MAGNET, A POLE PIECE AND A POLE RING ASSEMBLED TO DEFINE AN ANNULAR AIR GAP BETWEEN SAID POLE PIECE AND SAID POLE RING HAVING A SUBSTANTIALLY UNIFORM RADIAL FLUX DISTRIBUTION THEREACROSS, MEANS INCLUDING AN ANNULAR COIL DISPOSED IN SAID AIR GAP, MEANS COMPRISING A PAIR OF FLAT DISK SUSPENSION SPRINGS, MEANS FOR SUPPORTING SAID SPRINGS WITHIN SAID CASING, MEANS FOR CONNECTING THE CENTRAL PORTIONS OF SAID SPRING TOGETHER AND TO SAID MEANS INCLUDING SAID ANNULAR COIL THEREBY TO SUPPORT SAID COIL WITHIN SAID AIR GAP FOR RELATIVE MOVEMENT WITH RESPECT TO SAID MAGNET ASSEMBLY, AT LEAST ONE ELEMENT OF SAID MAGNET ASSEMBLY, SAID MEANS FOR SUPPORTING SAID SPRINGS, AND SAID SPRINGS, ALL HAVING A DIAMETER CLOSELY CONFORMING TO THE INTERNAL DIAMETER OF SAID CASING AND BEING ARRANGED IN A STACK IN PREDETERMINED SUPERIMPOSED RELATIONSHIP IN SAID CASING, AND MEANS ENGAGEABLE WITH SAID CASING FOR APPLYING PRESSURE TO ONE END OF SAID STACK AND COMPRISING THE SOLE MEANS FOR HOLDING SAID STACK IN ASSEMBLED RELATIONSHIP, AND IN ACCURATELY RELATED POSITIONS WHEREBY SAID ANNULAR COIL IS CONCENTRICALLY DISPOSED IN SAID AIR GAP REGARDLESS OF THE RELATIVE POSITIONS OF SAID COIL AND MAGNET ASSEMBLY AS DETERMINED BY SAID FLAT DISK SUSPENSION SPRINGS.

Claim 2

AN APPARATUS FOR USE IN SEISMIC GEOPHYSICAL EXPLORATION COMPRISING A CUP-SHAPED CASING, A MAGNET ASSEMBLY COMPRISING A PERMANENT MAGNET, A POLE PIECE AND A POLE RING ASSEMBLED TO DEFINE AN ANNULAR AIR GAP BETWEEN SAID POLE PIECE AND SAID POLE RING HAVING A SUBSTANTIALLY UNIFORM RADIAL FLUX DISTRIBUTION THEREACROSS, MEANS INCLUDING AN ANNULAR COIL DISPOSED IN SAID AIR GAP, MEANS COMPRISING A PAIR OF FLAT DISK SUSPENSION SPRINGS, MEANS FOR SUPPORTING SAID SPRINGS WITHIN SAID CASING, MEANS FOR CONNECTING THE CENTRAL PORTIONS OF SAID SPRING TOGETHER AND TO SAID MEANS INCLUDING SAID ANNULAR COIL THEREBY TO SUPPORT SAID COIL WITHIN SAID AIR GAP FOR RELATIVE MOVEMENT WITH RESPECT TO SAID MAGNET ASSEMBLY, AT LEAST ONE ELEMENT OF SAID MAGNET ASSEMBLY, SAID MEANS FOR SUPPORTING SAID SPRINGS, AND SAID SPRINGS, ALL HAVING A DIAMETER CLOSELY CONFORMING TO THE INTERNAL DIAMETER OF SAID CASING AND BEING ARRANGED IN A STACK IN PREDETERMINED SUPERIMPOSED RELATIONSHIP IN SAID CASING, AND MEANS ENGAGEABLE WITH SAID CASING FOR APPLYING PRESSURE TO ONE END OF SAID STACK AND COMPRISING THE SOLE MEANS FOR HOLDING SAID STACK IN ASSEMBLED RELATIONSHIP, AND IN ACCURATELY RELATED POSITIONS WHEREBY SAID ANNULAR COIL IS CONCENTRICALLY DISPOSED IN SAID AIR GAP REGARDLESS OF THE RELATIVE POSITIONS OF SAID COIL AND MAGNET ASSEMBLY AS DETERMINED BY SAID FLAT DISK SUSPENSION SPRINGS.