Explore Transactions Of The American Institute Of Electrical Engineers, Vol. 30: April 25 To June 30, 1911; Part II (Classic Reprint) Narrated By American Institute Of Electrical Enginee Presented In Paper Edition

from Transactions of the American Institute of Electrical Engineers, Vol,: Aprilto June,Part II

Arc Furnaces, The before mentioned Girod furnace with but one electrode Ofin, Cm. diameter and a current ofamperes atvolts showed a power loss Ofper cent in the electrode alone.
In the Heroult furnace the current is in general smaller but there are two electrodes in series and the result is about the same.
Not only is energy lost in the elec trodes by reason Of their high resistance but a large amount is also lost by means Of the water cooling of the jackets which is necessary because of their high conductivity for heat.
The cost Of maintenance of carbon electrodes is also considerable, Radiation loss is greater with the arc furnaces because a great deal Of the heat of the arc is reflected to the roof which must be water cooled to last, and even then has to be renewed about everydays.


Induction Furnaces. Tests made on a ton furnace at Volklingen have shown an electrical efficiency Ofper cent which is a contrast to theper cent lost in electrodes alone in arc furnaces.
The electrode plates never wear out for they do not come in contact with the molten metal or slag and the portion of the lining which acts as a conductor has been found in practice to last longer than any other portion Of the lining.


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