Abstract: A system for transmitting optical information uses several transmitters and receivers connected by optical fibers. The transmitters and receivers are arranged in individual networks in each of which all the optical fibers leaving the transmitters are coupled to one another and all the optical fibers arriving at the receivers are coupled to one another. In addition, all the optical fibers leaving the transmitters in each individual network are interconnected to the corresponding optical fibers, i.e., those leaving the transmitters, in all the other networks.

Abstract: An emission device includes a first electro optical converter for converting electrical energy from a supply source into optical energy. A second electrical converter is provided to convert the electrical energy into digital information which is converted into digital optical information by a second electro optical converter. A reception device includes two optoelectrical converters connected to the electro optical converters by an optical path, and an electrical power accumulator capable of storing said electric power delivered by said optoelectric converter. The power accumulator is capable of supplying the reception device with electric power.

Abstract: A rigid telescopic bar mounted over a pan, or a pot, for cracking eggshells by striking the latter against the bar. The bar comprises a sleeve portion, a stem slidably engaged in the sleeve portion, and hook members for securing the outer ends of the stem and sleeve portion to opposite portions of the side wall of the pan. The hook members are joined to the ends of the bar by universal joints to suit various outward inclinations of the side wall of the pan and to permit securing the bar over a selected zone of the pan bottom. Extension/retraction of the stem through the sleeve portion allows the device to adapt to pans, or pots, of various widths.