. The Bell System technical journal. Telecommunication; Electric engineering; Communication; Electronics; Science; Technology. 258 BELL SYSTEM TECHNICAL JOURNAL Melling and Casting For experimental investigation of magnetic materials in the laboratory, the raw materials easily obtainable on the market are generally satisfactory. When high purity is desirable specially prepared materials and crucibles must be used and the atmosphere in contact with the melt must be con- trolled. The impurities that have the greatest influence on the magnetic properties of high permeability materials are the non
. The Bell System technical journal. Telecommunication; Electric engineering; Communication; Electronics; Science; Technology. 258 BELL SYSTEM TECHNICAL JOURNAL Melling and Casting For experimental investigation of magnetic materials in the laboratory, the raw materials easily obtainable on the market are generally satisfactory. When high purity is desirable specially prepared materials and crucibles must be used and the atmosphere in contact with the melt must be con- trolled. The impurities that have the greatest influence on the magnetic properties of high permeability materials are the non-metallic elements,. Vig. 10—Induction furnace designed for small niclts in controlled atmosphere, as de- signed hy J. H. Scaff and constructed by the Ajax Northrup Company. j)articularly oxygen, carbon and sulfur, and the presence of these im[)urities is therefore watched carefully and their analyses are carried out with special accuracy. Impurities are likely to change in important respects during the melting and pouring on account of reactions of the melt with the atmos- phere, the slag or the crucible lining, or because of reactions taking place among the constituents of the metal. Melting of small lots (10 pounds) is best carried out in a high-frequency induction furnace, l-'igure 10 shows such a furnace designed for melting ten to lifty pounds, and casting by tilting the furnace, the whole operation being. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original American Telephone and Telegraph Company. [Short Hills, N. J. , etc. , American Telephone and Telegraph Co. ]
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
