. Journal of electricity. ctro-galvanizing process thereis installed one 15 horsepower, 220-volt, 3-phase, 60- cycle induction motor, direct connected to a 1500 am-pere, 5-volt direct current generator. Also a 10 horse-power, 220-volt, 3-phase, 60-cycle induction motordrives a rotating plating barrel, and a 200-ampere, 15-volt direct current generator for the copper shop. Before a metal can be properly galvanized it mustbe thoroughly clean, and for this purpose it is treatedby an electro process of cleaning (the reverse of plat-ing) or treated with dilute sulphuric acid. After being thoroughly
. Journal of electricity. ctro-galvanizing process thereis installed one 15 horsepower, 220-volt, 3-phase, 60- cycle induction motor, direct connected to a 1500 am-pere, 5-volt direct current generator. Also a 10 horse-power, 220-volt, 3-phase, 60-cycle induction motordrives a rotating plating barrel, and a 200-ampere, 15-volt direct current generator for the copper shop. Before a metal can be properly galvanized it mustbe thoroughly clean, and for this purpose it is treatedby an electro process of cleaning (the reverse of plat-ing) or treated with dilute sulphuric acid. After being thoroughly cleaned, the metal to begalvanized is suspended in tanks of sulphate of zinc so-lution with the electric current flowing for 45 minutesto one hour, when the metal is removed and brushedwith steel brushes and water and again subjected tothe galvanizing bath. This process can be repeated asmany times as desired, if between each coat the metalis well brushed with the steel brushes and water inorder to make each coat The three new buildings of the Portland Galvanizing Works Small parts, such as nails and screws, are handledin baskets, and scrubbed in rotating cylinders. In the hot-dip process the metal is thoroughlycleaned by boiling in sulphuric acid solution and scrub-bing, by means of a rotating sand blast barrel, or bythe use of a stationary sand blast apparatus. After themetal has been cleaned it is dipped, by means of smallhand cranes, into a molten zinc bath, the temperaturebeing about 850° F. The rotating sand blast barrel is driven by a12 x 10 air compressor, which in turn is driven by a50 horsepower, 220-volt, 3-phase, 60-cycle inductionmotor. This apparatus is an immense cylinder, inwhich the metal is placed and inside of which thereare four sand blast nozzels so directed that they causethe cylinder to rotate while the cleaning process isgoing on. The compressed gas is furnished by two com-pressors driven by 5 and 10 horsepower, 220-volt,3-phase, 60-cycle indu
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