. Graphite. wn in Figs. 40 and 41, the former being used for electrodes of rectangular sectionand the latter for round rods. The floor of the furnace is covered with a thin layer ofpulverized coal upon which the electrodes are stacked, with their long axes at right anglesto the long axis of the furnace. The piles of electrodes are separated by gaps aboutone-fifth the width of an individual electrode. Sheet iron is then placed in the furnacefor its entire length, and at a distance of about one inch from the ends of the electrodesand the side walls of the furnace. In this way, a sort of double w
. Graphite. wn in Figs. 40 and 41, the former being used for electrodes of rectangular sectionand the latter for round rods. The floor of the furnace is covered with a thin layer ofpulverized coal upon which the electrodes are stacked, with their long axes at right anglesto the long axis of the furnace. The piles of electrodes are separated by gaps aboutone-fifth the width of an individual electrode. Sheet iron is then placed in the furnacefor its entire length, and at a distance of about one inch from the ends of the electrodesand the side walls of the furnace. In this way, a sort of double walled box is inner shell is filled with ground coke of about 2 mm. grain, while in the outer is placeda mixture of sand and ground coke. The inner shell is filled up with coke until the upper- 117 most electrode is covered about 2 inches deep,upper part of the furnace covered over withcurrent is turned on. The sheet iron is then removed, and thethe sand-coke mixture, after which the /*&<?. Fig. 40. Section through electric furnace arranged for graphitizing carbon electrodes of rectangular section, a, brick base; b, end walls; c, electrodes; d, connexions to source of energy d; e, electrode charge; g, layer of powdered coal or coke; h, refractory lining; i, covering of sand and powdered coke. As shown in Fig. 41, the furnace used for round rods is similar to that for thoseof rectangular sections, only in stacking the electrodes, they are placed in close contact,instead of in heaps separated by gaps. ^&^ I
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Keywords: ., bookauthorcanadami, bookcentury1900, bookdecade1920, bookyear1920
