Abstract: In this system, which is of the type comprising at the end of a primary cable (3), a first fish (5) to which is connected a secondary cable (7) towed by a second fish, there are provided, in proximity to the first fish (5), apparatus (18) for measuring the angle between the direction of the relative current and the vertical plane passing through the secondary cable (7), and apparatus for measuring the angle of inclination of the secondary cable (7) to the horizontal, connected to apparatus for automatically steering the second fish so as to bring said angles to predetermined values.

Abstract: The invention relates to a process and an arrangement for aerial observation and/or communication for a submerged submarine. An apparatus (6) equipped with a television camera (15) or with a radio or radar antenna, and connected to the submarine by a cable (8), is initially accommodated in a tube (3) on board the submarine. This apparatus rises at high speed to the surface (27) of the water, because of its high buoyancy and low hydrodynamic drag, when it is released and the cable (8) is unwound by a winch, and then springs vertically out of the water, because of the kinetic energy acquired, for a sufficient time to permit an observation or a communication, which is transmitted to the submarine by the cable (8), and finally the apparatus is brought back into the tube (3) through the rewinding of the cable (8) onto the winch.

Abstract: The invention relates to Stirling engines and provides a modular assembly composed of a cylinder head, a heater, a regenerator, a cooler and a cold duct, and making it possible by mounting a plurality of identical modules on an engine assembly to construct a multi-cylinder double acting Stirling engine of the indirect heating type.