. The Bell System technical journal . mixed with water. This compoundreturns to a self-cleaning distributing launder in an enclosed steel launder consists of a pipe with slots evenly depositing the compoundover the entire width of the tank. The copper sludge settles to the bottomand the lighter impurities rise to the surface to be held back by a skimmerplate. The clarified super-natant solution rises over a dam into the pumpsuction chamber to be pumped at the rate of 200 gallons per minute to eachNo. 1 machine and 100 gallons per minute to each No. 2 machine. The COPPER WIRE DRAW
. The Bell System technical journal . mixed with water. This compoundreturns to a self-cleaning distributing launder in an enclosed steel launder consists of a pipe with slots evenly depositing the compoundover the entire width of the tank. The copper sludge settles to the bottomand the lighter impurities rise to the surface to be held back by a skimmerplate. The clarified super-natant solution rises over a dam into the pumpsuction chamber to be pumped at the rate of 200 gallons per minute to eachNo. 1 machine and 100 gallons per minute to each No. 2 machine. The COPPER WIRE DRAWING PLANT 113 heat from I he clean comijound is remoxed in heat exchangers as the com-pound is delivered to the machines. The compound is maintained at a])-proximately 130°F by a closed recirculating water system thermostaticallycontrolled, Fig. 19. Layout of Principal Wire Mill Equipment The building used for wire drawing is ideally situated adjacent to thecable manufacturing unit and has facilities for water, rail and motor truck. Fig. 18—Microscopic examination of diamond die polish by die maker deliveries. The area is easily ventilated and has excellent illuminationprovided by mercury vapor lamps, close to a high ceiling yet providing anaverage of more than 20-foot candle illumination. Stroboscopic effect ispractically eliminated by staggering the lamps over separate phases of thethree-phase circuit. The No. 1 machines are located adjacent to the copper rod receival No. 2 drawing machines, nine of them in a row, are placed in the centerof the building. Along the wall, five annealing bases for the electric belltype furnace are located. A bridge type crane handles all the material 114 BELL SYSTEM TECHNICAL JOURNAL between the No. 2 machines, anneahng and inspection. This layout,Fig. 20, of the equipment possible quick and easy transfer of material COPPER BEARING COMPOUNDFROM WIRE-DRAWINGMACHINES COMPRESSEDAIR I THERMOSTATI CONTROL pr-P-, , I n, \ I ENCLOSE
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