Abstract: An electrical ground connection having two members which are clamped together with each member having a cavity which faces the cavity of the other member when assembled. In one embodiment the cavities include a series of sharp projections and a disk of relatively soft metal such as copper is inserted into one of the cavities and when the members are brought together, the projections from both members penetrate into the disk to form a low impedance electrical connection which may be disassembled and reassembled with relative ease. An O-ring seal and a waterproof gel within the cavities may be utilized for underwater applications of the connector. In another embodiment a single projection in each cavity is used, in conjunction with a disk having a central aperture which fits over the projections, with edge portions of the projections digging into the central wall surface of the apertured disk.

Abstract: A sonar transducer wherein a plurality of transducer modules are affixed along the length of a mounting member in the form of an elongated bar. The bar is contained within a protective housing and the mid point of the mounting member is affixed to the back wall of the housing in a manner that the mounting member stands off from the back wall of the housing. The mounting member is cantilevered on either side of the mounting position and is totally enclosed within the outer housing which is affixed along its entire length to a host structure so as to isolate and protect the alignment of the transducer modules from distortions.

Abstract: A separable joint for a two-part oceonographic sensor package wherein the two parts are cylindrically shaped and joined by a cylinder of chemically tempered glass. A pyrotechnic device inside the unit will, upon command, activate to shatter the glass thereby effecting separation. A second and similar pyrotechnic device is provided for redundancy.