Abstract: An apparatus for the multiple analysis of gases which can react with another gas to produce emission of light has at least two reaction chambers (1a, 1b), a single photodetector (3) and an optical redirection system (2) with a reflection surface movably mounted between the reaction chambers for sequentially and rapidly redirecting the light from the two reaction chambers onto the single photodetector for evaluation.

Abstract: For extension of data traffic within a telephone exchange system to separate data exchange systems, special connecting sets, which are provided for data traffic within the telephone system, are fixedly connected via special facilities with subscriber exchange lines of the separate data exchange system. The special facility thereby takes over the function of the conversion from line and data signals from one system into the other and vice versa. For securing of telephone subscriber selection criteria in the case of arriving traffic from the data exchange system, arriving connection requests are only acknowledged if the selection digits which are necessary for the build-up of the telephone connection which conducts them further have arrived in the special facility. Besides this, the telephone ring signal for the desired telephone station is suppressed.

Abstract: Apparatus is described for telecommunication facilities having transmission paths capable of accommodating different types of message switching, e.g., voice communications and data communications. A changeover device in the subscriber stations in the system switches between the two modes of communication by means of a mode selector switch for causing manual or automatic switching between the two forms of communication. After switching through a call carried by a given connector set, a signal is automatically sent from the connector set to the called subscriber station. This signal causes an automatic changeover from the form of message communication being used to a second form, e.g., from voice to data. Upon completion of the changeover in the called subscriber station, acknowledgement of this fact is made by sending a back signal from the called station. Responsive to this acknowledgement, a signal is likewise sent to the calling subscriber station.