A high tensile strength cable for use in remote control of equipment has a double-coated optical fibre with a number of outer non-metallic reinforcing strands and an intermediate space filling of low friction, the outermost spaces concerned are filled with a crosslinking polymer forming a bond, and a covering of a crosslinking polymer surrounds the whole structure. Pref. reinforcement strands have glass or polyaramid fibres and the structure pref. has an outermost layer of ethylene-vinyl acetate-based thermoplastic adhesive. ADVANTAGE - The cable has a very high tensile strength so that it can be used in small o.d. (in contrast with Cu core cables). It is suitable for use on e.g. cable-controlled torpedos. The example shown has the centre optical fibre (2) in a double-layer sleeve with an outer low friction layer (3) and beyond this outer reinforcing strands (4) with circular or other cross-section. The low friction layer (3) used is sufficient to fill in the intermediate spaces (6). The o.d. of the core plus sleeves equals that of the strands (4). The outer intermediate spaces (5) formed by the strands (4) are filled with e.g. polyester; epoxide or acrylic copolymer, and the outermost covering (7) is a thin layer of similar polymer.
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