Transactions of the American Institute of Electrical Engineers, Vol. 30

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Excerpt from Transactions of the American Institute of Electrical Engineers, Vol. 30: April 25 to June 30, 1911, Part IIArc Furnaces. The before mentioned Girod furnace with but one electrode Of 14 in. Cm.) diameter and a current of 6200 amperes at 60 volts showed a power loss Of 10 per 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 re¿ected to the roof which must be water cooled to last, and even then has to be renewed about every 14 days.Induction Furnaces. Tests made on a ton furnace at Volklingen have shown an electrical efficiency Of 97 per cent which is a contrast to the 10 per 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.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully, any imperfections that remain are intentionally left to preserve the state of such historical works.