. The Bell System technical journal. Telecommunication; Electric engineering; Communication; Electronics; Science; Technology. 262 BELL SYSTEM TECHNICAL JOURNAL of the gases given off by magnetic metals during heating are formed from the impurities carbon, oxygen, nitrogen and sulfur; CO is usually given off in greatest amount from cast metal, and some No and H2 are also found. Refining of the melt is therefore of obvious advantage, and the furnace of Fig. 10 is especially useful for this purpose. Small ingots are sometimes made by cooling in the crucible. Usually, however, ingots are poured i
. The Bell System technical journal. Telecommunication; Electric engineering; Communication; Electronics; Science; Technology. 262 BELL SYSTEM TECHNICAL JOURNAL of the gases given off by magnetic metals during heating are formed from the impurities carbon, oxygen, nitrogen and sulfur; CO is usually given off in greatest amount from cast metal, and some No and H2 are also found. Refining of the melt is therefore of obvious advantage, and the furnace of Fig. 10 is especially useful for this purpose. Small ingots are sometimes made by cooling in the crucible. Usually, however, ingots are poured into cast iron molds for subsequent reduction by rolling, etc.; permanent magnet or other materials are often cast in si;nd. Fig. 13—Design of rolls in a blooming mill for hot reduction of ingots to rod. Carnegie Illinois Steel Corp. in shapes which require only nominal amounts of machining or grinding for use in apparatus or in testing. Special techniques are used for specific materials. Other considerations important in the melting and pouring of ingots are proper mixing in the melt, the temperature of pouring, mold construction, inclusions of slag, segregation, shrinkage, cracks, blow holes, etc. Fabricalioii Magnetic materials require a wide variety of modes of fabrication, which can best be discussed in connection with the specific materials. The methods include hot and cold rolling, forging, swaging, drawing, pulverization, elec-. 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
