L'industrie métallurgique et électrochimiques . theuntreated t et d'où le sable est retourné à l'appareil pour un nouveau traitement.four électrique.-J. M. Morehead, Chicago, cédant à UnionCarbide 782 917 brevets Co., le 21 février 1905. Application a déposé 1,9 Octobre 1903.Le four est spécialement destinée à la production de cal-cium carbure, et est une amélioration sur le formerfurnace les inventeurs, qui comprend un capot enveloppant les électrodes, thecharge nourris autour de la hotte afin d'exclure les airand pour diriger les gaz résiduaires dans le capot. Le inventorstates qu'il a trouvé que le

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Electrochemical and metallurgical industry . t 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 1, 9, 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 found 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. FIG. I.- 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 working chamber consisting of awheel I with removablecover plates 2. An ironhood, carrying electrodes4 fixed 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 II 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. A pipe is provided

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