Abstract: A cable in the form of a tubular braid which is built of two oppositely directed, helically interlaced sets of strands of untwisted, individually insulated, fine copper wires. Each wire strand of each set repeatedly passes over two consecutive strands, and then under the next two consecutive strands, of the other set. At each extremity of the braid, the end portions of all the stranded wires are stripped of their insulations, assembled into two predetermined groups, and preferably soldered, to provide a pair of terminals.

Abstract: A submersible cable for a fish-repelling installation comprises a central conductive-wire core covered with a conductive smoothing layer and then with an insulating layer. A first conductive layer is applied over this first insulating layer, then a second insulating layer and a second conductive layer that constitutes a field limiter. Armor in the form of synthetic-resin strands is then wound over the cable and a waterproof layer is applied to the outside of the cable. After the application of each insulating layer the cable is tested for leakage in order to repair any discovered leaks before the next conductive layer is applied to the cable.

Abstract: The method and apparatus of the present invention are described in which connection (and disconnection) of a plurality of geophones associated with a digital seismic data acquisition system is greatly simplified without sacrificing flexibility as to the number of geophone flyers per station or the interval spacing per station and also without the addition of separate subcabling in the internal linkage of the flyers to the field digitizing equipment. The apparatus includes a multiple-phone flyer-jumper connected to each channel of a remote data acquisition and telemetering circuit (RDATC). Each RDATC acts in combination with a group of geophone flyers, say four, to store, amplify, filter, gain control and digitize analog data from the flyers and then telemeter the data to recording circuitry in the field truck. In accordance with the present invention, each jumper-flyer includes a central multi-conductor cable segment terminating at each of its ends in the central leg of a multi-armed connector.