Ingénierie chimique . hors et à partir de laquelle le sable non traité est retourné à l'appareil de retraitement.four électrique.—J. M. Morehead, Chicago, cédant à UnionCarbide Co. Brevet 782 917, 21 février 1905. Applica-tion déposée le 19 octobre 1903.Le four est spécialement conçu pour la production de carbure de calcium cal, et est une amélioration sur le four de coffrage des inventeurs, qui comprend une hotte enfermant les électrodes, le thécarge étant alimenté autour du capot afin d'exclure l'air et de diriger les gaz de déchets dans le capot. L'inventoriage indique qu'il a le courage que la charge peut avantagageo

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Chemical engineering . out and from which theuntreated sand is returned to the apparatus for retreatment.Electric Furnace.—J. M. Morehead, Chicago, assignor to UnionCarbide Co. Patent 782, 917, February 21, 1905. Applica-tion filed October 19, 1903.The furnace is specially intended for the production of cal-cium carbide, and is an improvement on the inventors formerfurnace, which comprised a hood enclosing the electrodes, thecharge being fed around the hood in order to exclude the airand to direct the waste gases into the hood. The inventorstates that he has foimd that the charge may advantageouslybe fed directly into the hood, and that the waste gases willstill collect in the hood, although obliged to pass through aconsiderable body of the charge before they reach the gasoutlet. This upward movement of the gases is believed tobe due to the fact that the gases rising from the zone of reac-tion at the lower end of the electrodes tend to work upwardsthrough the charge along the electrodes, and that they will. therefore pass along the electrodes through a path of greaterlength than through the charge itself. It is stated that thisnew construction enables the furnace to be operated with greatregularity and without filling the surrounding atmospherewith dust from the finely divided charge. The furnace, shownin vertical section in Fig. i, is of the Horry type, the workingchamber consisting of awheel I with removablecover plates 2. An ironhood, carrying electrodes4 fi.xed in vertical adjust-able holders 5, dependsinto the open end of theworking chamber. Thetop of the hood is closedby a cast-iron plate, con-taining a chamber forwater-cooling purposes, with water inlet and outlet8 and 9. Parallel open-ings 10 are provided forreceiving the electrode-holders, and a refractoryluting 11 is filled into the space left between the walls of theopenings and the holders, after the electrodes have been ad-justed to their proper height. .X pipe is provided for the pur-pose of introducin

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