Canadian foundryman (1917) . ing all auto-matic electrode regulation, althoughmotors with push button control are con- there is only one door, and the largersizes have but two doors, and are madeto fit as close as possible. The clearanceof the cooling boxes is also made Vs-inch clearance is allowed, whichis just enough room to compensate forthe slight irregularity in the manufac-ture of what are ordinarily perfectlyround electrodes. Probably the greatest advantage thatcan be accorded to this type of furnaceis its adaptability to the satisfactorydissolution of all kinds of metal, such
Canadian foundryman (1917) . ing all auto-matic electrode regulation, althoughmotors with push button control are con- there is only one door, and the largersizes have but two doors, and are madeto fit as close as possible. The clearanceof the cooling boxes is also made Vs-inch clearance is allowed, whichis just enough room to compensate forthe slight irregularity in the manufac-ture of what are ordinarily perfectlyround electrodes. Probably the greatest advantage thatcan be accorded to this type of furnaceis its adaptability to the satisfactorydissolution of all kinds of metal, such ascopper, bronze, red brass, nickel, alum-inum, and such mixtures where zinc doesnot predominate, or where the percent-age is low. The quiet state in which themetal is retained during the melting pro-cess is one of the chief reasons why theoxidation and volatilization is kept verylow, thus preventing the escape ofpoisonous gases from copper may also explain in a measure whythe burn-off in ordinary miscellaneous. •RENNERFELT ELECTRIC ARC FURNACE INSTALLATION. templated. As only 4 or 6 pounds ofAcheson graphite are burned away perton of cold steel scrap or pig iron, meltedand treated, it is evident that the elec-trode regulation with such a steady arc,made between three points of stability,that is, the tips of three electrodes, is aminimum. Light metal scrap or turn-ings can be heaped in the furnace withthe electrodes touching the charge, andyet before many minutes the free burn-ing arc between the electrode tips hasestablished itself. The majority of thesefurnaces are operating with basic bot-toms; but in the case of a few, wherehigh-class raw material is available atreasonable prices, the acid bottom hasbeen adopted. The wear of the electrodes seems 1odepend upon three things—first, thedensity of the current; second, the cir-cular area and length exposed inside thefurnace; and third, the amount of airleaking into the furnace. The lattercause seems to have the
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