Abstract: A particular embodiment comprises:a rigid body which is closed in watertight manner at both ends;six thermally conductive rigid receptacles each having a face which is complementary in shape to the shape of the inside wall of the body, the receptacles containing electronic circuits;layers of thermally conductive flexible materials disposed between the wall and the faces of the receptacles;supports each supporting two receptacles;a fixed ring integral with the body;a removable ring fixed to the fixed ring; andfixing devices each including a screw, resilient washers, and an insulating sleeve, thereby exerting outwardly directed radial forces when the screws are screwed radially into the removable ring.The housing is suitable for the repeaters of undersea connection cables.

Abstract: An electronic circuit housing primarily applicable to undersea transmission-line repeater equipment includes a pressure-resistant tubular steel shell provided with water-tight end walls and containing a cylindrical assembly of frames having the shape of cylindrical sectors. Each frame is attached at one end to a radial flange of the internal shell wall and at the other end to an expandable collar provided with sliding wedges and locked by expansion in the internal shell wall. The fastening system facilitates mounting and accurate centering of the frames within the tubular shell, thereby guaranteeing a constant thickness and therefore uniform thermal conductivity of the interface between frame and tubular shell.