Electrochemical and metallurgical industry . Vol. 1. No. 4, p. 130. increased size of the furnace terminals, which, being goodconductors of heat as well as electricity, would increase heat_losses in that way. The important thing to determine, how-ever, is where the greatest efficiency is obtained. Electrode Furn.\ was originally proposed to grapliitize carbon articles b\the Acheson process in a furnace where the articles were em-bedded in powdered carbon, but in a later patent an im-proved method of heating electrodes to the graphitizing tem-perature is described. In Fig. i is shown a ver
Electrochemical and metallurgical industry . Vol. 1. No. 4, p. 130. increased size of the furnace terminals, which, being goodconductors of heat as well as electricity, would increase heat_losses in that way. The important thing to determine, how-ever, is where the greatest efficiency is obtained. Electrode Furn.\ was originally proposed to grapliitize carbon articles b\the Acheson process in a furnace where the articles were em-bedded in powdered carbon, but in a later patent an im-proved method of heating electrodes to the graphitizing tem-perature is described. In Fig. i is shown a vertical longi-tudinal section of the furnace, where c c are the terminals, cthe carbon electrodes arranged in piles, g granular carbon, hrefractory lining, / covering material of ground coke and will be ol)served that when the current is thrown on, itpasses alternately through sections of the furnace filled withgranular carbon or electrodes, and as the resistivity of a massof the granular carbon is ver\- much greater than that of the. Kic;. I.— section of electrode furn.\ce. electrode the chief generation of heat takes place in the lies the chief feature of the invention, for by thisingnious arrangement the use of currents of very low voltageand enormous ampereage is avoided. Details of the construction of an electrode furnace are givenin the patent specifications, and from these the following tablehas been drawn up : Distance between terminals of furnace 360 inches Length of space filled by electrodes 302 Length of space filled by granular carbon 58 Length of electrodes under treatment 24 Width of electrodes under treatment 5 Height of pile of electrodes 17 Initial voltage 210 volts Initial ampereage 1,400 amps. Volts at end of five hours 210 volts .\mperes at end of five hours 3,600 amps. Final voltage 80 volts Final ampereage 9,000 amps. From this table we may calculate the resistance of the furnace at various stages of the run, assuming t
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Keywords: ., bookcentury1900, bookdecade1900, booksubje, booksubjectmetallurgy
