Abstract: Above the electroplating trough, a lock chamber is arranged which can be flooded with protective gas and is subdivided by means of an intermediate door into an outer chamber and a main chamber. The outer chamber has an outer lock door while the main chamber is connected to the electroplating trough by an inner lock opening. In addition, a work piece transfer device is provided which can be moved between the outer chamber and the main chamber and can be operated from the outside.

Abstract: Apparatus for electrodepositing aluminum in which an electroplating trough, which contains aprotic oxygen-free and water-free organo-aluminum electrolyte, is closed off in an airtight manner and is accessible only via a lock chamber disposed thereabove and which uses, for inserting and removing the work pieces, a detachable coupling rod carrying a frame with the articles to be electroplated permitting a strongly adhering aluminum layer to be deposited onto work pieces of any design desired with the exclusion of air.

Abstract: In apparatus for the preparation of a semiconductor compound such as gallium phosphide using the Bridgman method in a horizontal system equipped with a heating device and disposed in a pressure vessel, the reaction tube is mounted in a stationary fashion in a reaction boat and the heating device supported so that it is moveable in the direction of the horizontal axis of the system to permit synthesis of the semiconductor compound along with zone melting and drawing of single crystals. A light guide having its free end arranged below the reaction tube is mounted to the heating device for movement therewith and is used to measure the temperature at the reaction boat.

Abstract: Apparatus for measuring the temperature of a granular semiconductor material of the type which is evaporated when manufacturing a semiconductor such as gallium phosphide within an ampoule or reaction tube, in which a temperature sensor is installed in a measuring tube having a closed end extending into the ampoule and the semiconductor material therein and an opened end which is sealed into a suitable opening in the end of the ampoule with the electrical leads for the temperature sensor being brought out from the measuring tube through the opening in the ampoule.