. The Bell System technical journal . B. Level Set—Oxygen .050 ■ • -^ ,v JilUffiT C. Low Set iJxygen .12% Fig. 25—Photomicrographs of wire bar (magnification X 100) 216 BELL SYSTEM TECHNICAL JOURNAL oxide, which caused the metal to shrink in solidifying.* When ex-cessive shrinkage occurs it has an adverse effect during the rollingoperation. The finished wire is inspected for dimensional limits, tensile strength,elongation, and surface condition. The limits for 42 B. & S. gaugewire (.002475 in.) are .00245 in. minimum and .0025 in. maximum. Conclusion The establishment of this industry as
. The Bell System technical journal . B. Level Set—Oxygen .050 ■ • -^ ,v JilUffiT C. Low Set iJxygen .12% Fig. 25—Photomicrographs of wire bar (magnification X 100) 216 BELL SYSTEM TECHNICAL JOURNAL oxide, which caused the metal to shrink in solidifying.* When ex-cessive shrinkage occurs it has an adverse effect during the rollingoperation. The finished wire is inspected for dimensional limits, tensile strength,elongation, and surface condition. The limits for 42 B. & S. gaugewire (.002475 in.) are .00245 in. minimum and .0025 in. maximum. Conclusion The establishment of this industry as a part of the plant at Chicagorepresents the combined effort of a large number of inventors, engineers,designers, and mechanics. While the actual plant was built within acomparatively short period, the advances which have been made in theart represent several years effort. Briefly, the development of com- CONYENTIONAL MECHANICALAND HANDLING PRACTICE inPROVED MECHANICALAND HANDLING PRACTICE. MieETA ^ 5Q FT Fig. 26—Wire drawing pltint pact and high speed wire drawing machines has required a much smallerinvestment in buildings and equipment as compared with a plant of thesame capacity using commercial equipment. A comparison of therelative floor area, based upon the conv^entional and the improved typesof wire drawing equipment, is illustrated by Fig. 26. The super-visory force in charge of the operation of this new mill must be given aconsiderable share of the credit for its successful operation. Copper Refining, Lawrence Addicks. Metallurgy of Copper, H. An Analyzer for the Voice Frequency Range By C. R. MOORE and A. S. CURTIS [Editorial Note: The frequency analyzers described in this paper andin the paper immediately following, demonstrate in an unusual mannerhow a single fundamental principle may be employed to accomplish quitedissimilar results. The analyzers described in both papers employ aresonating element of fixed frequency and translate the wave
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