. Electrical world. the term is improper, since no electrolytic action takes place; theelectrodes are here nothing but terminals by which the electriccurrent is introduced into the charge from the external source ofcurrent. The most radical course of solving this difficulty is to use no elec-trodes or terminals whatever, but to introduce the electric currentinto the charge by inductive action in the same way as electricalenergy is transported from the primary of a transformer to itssecondary. In fact, the induction furnace, as operated by Kjellin,at Gysinge, in Sweden, for the production of sp
. Electrical world. the term is improper, since no electrolytic action takes place; theelectrodes are here nothing but terminals by which the electriccurrent is introduced into the charge from the external source ofcurrent. The most radical course of solving this difficulty is to use no elec-trodes or terminals whatever, but to introduce the electric currentinto the charge by inductive action in the same way as electricalenergy is transported from the primary of a transformer to itssecondary. In fact, the induction furnace, as operated by Kjellin,at Gysinge, in Sweden, for the production of special steels, is essen-tially a transformer; its primary winding, having a large number ofturns, is supplied with high-tension alternating current, while thesecondary has a single turn and is constituted by the charge to bemelted. However, the furnace design of Kjellin seems to be capableof improvement. The efficiency of his furnace is rather low. Ac-cording to Electrochemical Industry (December, 1903, page 578) the. FIG. I.—SCHNEIDER INDUCTION FURNACE. electric power supplied to the primary is 165 kw, of which kware lost and only kw are utilized in the secondary. The efficiencyis, therefore, only 47 per cent. In a patent, granted on June 7, G. P. E. Schneider, of Le Creusot,France, remarks that if the secondary (i. e., the charge to be treated)is made in form of a single ring of uniform cross-section, the currentinduced in it will be unnecessarily high and the reaction of thiscurrent upon the primary coil will produce an unfavorably largephase difference in the primary circuit. Schneider proposes, there-fore, to increase the resistance of the secondary by making it inform of a tube of small cross-section, communicating at its bothends with a crucible of large dimensions containing the greater partof the charge. The latter part of the charge will then be at a consid-erably lower temperature than the charge in the tube. The one endof the tube is at a higher lever tha
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectri, bookyear1883
