Abstract: In order to be able to install in juxtaposed manner several satellites beneath the nose cone of the same launcher without any collision risk at the time of their separation, between each satellite and the support plate is positioned an adaptor. During launch, the adaptors occupy a size-limiting carriage position. When it is wished to control the separation of a satellite, its adaptor passes into a separation position, in which the satellite is tilted or swung away from the neighbouring satellite or satellites.

Abstract: A high-voltage circuit-breaker comprises a first insulative support column carrying a first current terminal and a pivoting cut-off arm provided with a first contact. An insulative column rotates to maneuver the cut-off arm. A second insulative support column carries a second current terminal and a jaw-type second contact cooperating with the first contact when the circuit-breaker is closed. The pivoting arm rotates about its axis through 90.degree. at the start of an opening maneuver or at the end of a closing maneuver to close the jaw on opening the circuit-breaker and to open the jaw on closing the circuit-breaker. The cut-off arm is extended by a cylindrical assembly containing a resistance and comprising a metal exterior tubular portion connected electrically to the resistance.

Abstract: Optical fibre delay line device for producing a delay on a guided light pulse proportional to the length of the optical fibre, comprising single means for the emission and detection of the light pulse, constituted by a semiconductor laser diode also having photodetecting properties and coupled to one of the ends of the optical fibre. The other end of the optical fibre is rendered reflective or is coupled to a waveguide of variable length, which also has a reflecting end, in such a way that the light pulse traverses the length of the optical fibre twice.

Abstract: A cinematographic film to be reproduced by television is driven at constant speed in synchronism with the sweep cycle of one or more camera tubes each positioned to pick up images projected upon a receiving surface thereof whose luminous persistence equals at least a sweep cycle. The film is periodically transluminated, during the retrace phase of the scanning beam, by a light pulse emitted by an electroluminescent diode -- or by a cluster of such diodes operating on different wavelengths -- defining a quasi-pinpoint light source, the diode being excited by an energizing pulse whose length does not exceed the duration of a line scan of the camera tube.

Abstract: In the telecommunication system using optical fibers, each terminal or repeater station comprises negative feedback via an optical channel, the output electroluminescent diode being coupled to the input photodiode by an optical fiber.