Abstract: A waterproof geophysical connector including a rigid plastic body supporting a hard plastic insert which in turn supports a plurality of electrical contacts. A compression nut is connected to the body and an electrical cable extends through the compression nut to the inside of the body and is connected to the electrical contacts. A plastic potting compound fills the body and a plastic overmold is applied between the cable and the body and a fluid clearance space is provided between a rotatable coupling ring and the outside of the body for clearing debris.

Abstract: A geophysical connector (10) having a housing (46, 52) and first (11) and second (131) connection members. First member (11) includes a low durometer soft plastic body (12) molded to the electrical contacts (20, 21) and encloses a rigid waterproof molded seal (34) molded about said contacts (20, 21). The second connection member (131) includes a rigid plastic insert (133) supporting a second coacting electrical contacts (135, 137) and a soft plastic body (159) bonded to the insert (133) and the electrical cable (163) connected to the second contacts.

Abstract: An electrical geophysical connector comprising an outer housing, a first connection member and a second connection member. First and second coacting electrical contacts are positioned in the first and second members, respectively. The first member includes a rigid outer shell and a resilient inner core bonded to the first electrical contacts. The first ends of the first contacts are positioned in cavities located in one end of the inner core and resilient seal rings are formed about the cavities for engaging and sealing the coacting engagement of the first and second contacts. A dust cap is rotatably mounted with a 360.degree. rotation to the housing and the exterior of the housing is tri-lobed in cross section for ease of gripping.

Abstract: A repairable geophone housing having a fully molded waterproof one piece upper body which is seabably and releasably connectible to a lower body. All surfaces within the upper body are bonded to prevent moisture entering and the geophone transducer may be replaced if desired.

Abstract: A method is described for controlling the magnetic field strength of an electromagnetic geophone by: a) providing a specified center value each for a geophone sensitivity parameter and a geophone damping parameter; b) magnetizing an electromagnetic geophone to full saturation of the magnet; c) measuring the value each for the fully saturated geophone sensitivity parameter and damping parameter; d) partially demagnetizing the geophone; e) measuring the value each for the partially demagnetized geophone sensitivity and damping parameters; f) calculating a slope for a geophone demagnetization line representing geophone demagnetization versus demagnetizing force by utilizing the measured fully saturated geophone sensitivity and damping parameters as one point on the line and utilizing the measured partially demagnetized geophone sensitivity parameter and damping parameter as another point on the line; and g) calculating an amount of demagnetization required to provide the geophone with sensitivity and damping par

Abstract: A hydrophone retrieval system is described, which includes: a) a case having an interior chamber adapted to house an anchor fixture within the chamber, the case having at least one sealable opening therein adapted to accept therethrough an electric leader cable and a retrieval cable, in a water-tight manner; b) an anchor fixture disposed within the chamber, where the anchor fixture includes an anchor member portion, wherein a first end of the electric leader cable passes through a first aperture formed in the anchor member portion; c) a first end of the retrieval cable passing through a second aperture formed in the anchor member portion; d) a retrieval cable termination element attached to the first end of the retrieval cable within an interior portion of the fixture, wherein the diameter of the retrieval cable termination element is greater than the diameter of the second aperture; and e) a base member portion, wherein the anchor member and base member portions are rigidly separated from each other at a fix

Abstract: A multiple pin connector for a multiple conductor cable formed of a housing having a face plate, a hollowed-out central area and a passageway to permit a multiple conductor cable to extend from the housing exterior into the hollowed-out central area wherein the housing includes a raised "U-shaped" collar having "U-shaped" collar ends terminating in a differential locking boss having a keyway which extends toward the other end of the face plate and with a clamping lip located on the exterior of the "U-shaped" base of the raised collar, a pair of aligned inserts located in the face plate having a plurality of elongated male connectors in a first semi-circle section and a plurality of elongated female connector sockets in a second semi-circle section with the male pins and female connector sockets extending substantially perpendicular from the face plate and arranged in the inserts in a parallel spaced relationship and in identical pattern to form a hermaphrodite connector, and a stirrup interlock having bifurca

Abstract: A compact, high sensitivity low distortion seismometer having an elongated tubular outer pole formed of a magnetic material, a magnetic assembly located in the interior of the outer pole and having a permanent magnet and a pair of conductive pole pieces electrically and magnetically coupled to the magnet, a coil and mass assembly positioned for vertical and rotational movement relative to the magnetic assembly and which includes a coil form, a pair of conductive preformed springs one of which is fixedly attached to each end of the coil form, a pair of coils having the center thereof axially aligned with the axis of the coil form with one of the coils positioned at each end of the coil form, a pair of commutating rings, one of which is attached to each end of the coil form and in electrical and physical contact with an adjacent spring, a pair of insulators, one of which is attached to each end of the coil form to support and electrically insulate the conductive spring and commutating ring adjacent thereto from

Abstract: A geophone for sensing vibrations having a metal housing, a permanent magnet positioned in the center of the housing with a predetermined spacing between the exterior of the permanent magnet and the housing, a spring assembly having a pair of disc shaped deflectable torsion springs, one of which is located between the top of the permanent magnet and the top of the housing and the other of which is located between the bottom of the permanent magnet and the bottom of the housing, and a coil form fabricated from an electrically conductive material, which coil form is positioned in the predetermined spacing between the housing and magnet and which is adapted to enclose the permanent magnet, the coil form ends being adapted to engage and cooperate with the pair of disc shaped springs for movement of the coil form in a direction substantially parallel to the axis of the permanent magnet and wherein the coil form further includes a surface contiguous the housing defining at one end thereof a pair of spaced parallel

Abstract: A flexible strap support fastener including a hanger ring having means defining a cavity at an edge thereof and having a first opening and a second opposed aligned opening with at least one wall of the cavity being formed into a ramp, a wedge-shaped locking member adapted to be inserted into the cavity and having a thin end which extends through the second opening, a thick end which extends through the first opening, a sloping surface which engages the ramp surface and a planar surface of a predetermined transverse width having ridges formed across the width thereof pointing toward the first opening, a flexible strip forming an integral unit between the locking member and the ring and a flexible strap having an elongated recessed central area having ridges located on the surface of the recessed area and with one strap end affixed to the ring between the first opening and the second opening with the ridges in the recessed area pointed towards the first opening and the other strap end being adapted to be wrappe

Abstract: A fluid tight geophone case having a case nose having an interior cavity for receiving the geophone to be enclosed and a mounting means for receiving an elongated spike wherein the case nose includes a threaded collar and indentation in the collar for receiving a first O-ring seal, a case top which is tapered having a hollowed-out central area, a small passageway at the top which is a restriction in the form of a cone with base directed toward the central area and a large opening at the bottom which is internally threaded to mate with the case nose and having a slot to receive the first O-ring seal, a tapered compression cone having thin side walls, a small tapered end having an aperture which is formed in an inverted cone forming a grommet cavity with the passageway of the cone, a shaped cavity in the interior of the compression cone and a large opening at the other end with an annular shaped slot formed around the outer periphery of the end to receive a second O-ring seal and a yieldable grommet located in

Abstract: A rigid, fluid resistant enclosure adapted to encase a geophone electrically connected to a cable including a housing having an open end in and inner walls defining a cavity adapted to receive a geophone encapsulated in a fluid tight membrane or boot, which membrane has a sealing ring located around the top edge of the geophone, the open end of the housing having a counterbore axially aligned with and formed into the cavity terminating in a countersink having inwardly sloping walls defining a sealing surface which communicates with the inner walls of the cavity, a flexible header positioned within the counterbore and countersink of the open end of the housing and two resilient opposed elongated cable entry means having sealing nipples adapted to have a cable extended therethrough into a hollowed out central area which is to be electrically connected to the geophone and wherein the resilient sealing nipples have a plurality of axially aligned sealing ridges extending around the interior thereof to engage with

Abstract: A rigid, durable, fluid-tight metal enclosure adapted to enclose a cylindrically shaped geophone electrically connected to a cable having a housing formed of a metal and having an open end through which a geophone is inserted and a closed end, a flexible header mounted in the housing at the open end thereof having a pair of conical shaped cable supports extending therefrom in opposite directions adapted to have a cable pass therethrough into a hollowed out central area of the header to be electrically connected to the geophone, the flexible header includes an annular shaped ring member for forming, under a clamping pressure, a fluid-tight seal between an annular shaped ring member and the housing and between the cable supports and cable and having an annular shaped lip member adapted to make yieldable engagement with the top of the geophone, a circular-shaped stress ring having a pair of opposing aligned holes and positioned in the hollowed out central area of the flexible header to enable the cable to be pas