Abstract: Gallium-alkyl compounds are produced, in that gallium-halogen compounds are reacted with alkyl aluminum halogenides in the presence of metal halogenides as auxiliary bases. Preference is given to the use of the corresponding chlorides and to the chlorides of the metals of groups I to III of the periodical table as auxiliary bases.

Abstract: A transportation device for conveying large volume and heavy goods to be cooled in cooling tunnels is characterized by a stationary grate mounted to the tunnel floor with supports for this grate located at intervals with respect to each other parallel to the direction of conveyance, and a movable grate having its supports disposed between the supports of the stationary grate with the movable grate driven in a closed curve or loop in a vertical plane parallel to the direction of conveyance in such a manner that the supporting surfaces of the movable grate are substantially above the supports of the stationary grate when moved in the conveying direction but are substantially below the supports of the stationary grate when moved against the direction of conveyance.