. Railway mechanical engineer . alled thi cathode,at wliifli till hydrogen is generated. The water flows from a 312 RAILWAY MECHANICAL ENGINEER Vol. 96, No. 6 reservoir down into the cell where it is decomposed by iinelectric current. The oxygen and hydrogen pass upward,each through bell jars to pipes leading to big gas these holders the gases are taken and compressed intosteel cylinders for the market. This method of making oxygen was one of the first usedfor commercial purposes. There is, however, liability of theoxvgen being contaminated with a sufficient quantity of im-puritie
. Railway mechanical engineer . alled thi cathode,at wliifli till hydrogen is generated. The water flows from a 312 RAILWAY MECHANICAL ENGINEER Vol. 96, No. 6 reservoir down into the cell where it is decomposed by iinelectric current. The oxygen and hydrogen pass upward,each through bell jars to pipes leading to big gas these holders the gases are taken and compressed intosteel cylinders for the market. This method of making oxygen was one of the first usedfor commercial purposes. There is, however, liability of theoxvgen being contaminated with a sufficient quantity of im-purities, to cause an explosive mixture, and insurance rulesprohibit the sale of electrolytic oxygen containing more thantwo per cent of impurities. In some instances electrolytic plants are erected for themanufacture of hydrogen for the hydrogenation of fats inpacking plants, and then oxygen is the by-product. In otherinstances the electrolytic plant is used to supply oxygen tothe trade, which leaves hydrogen as the by-product. Elec-. Fig. 2—Machinery Room for Manufacturing Liquid Air Oxygen trolytic oxygen is sold in steel c\linders containing about200 cu. ft. at 1,800 lb. pressure per sq. in. Liquefaction Oxygen.—The method used to manufac-ture the largest proportion of oxygen consumed in the UnitedStates is by the liquefaction of air, and probably the mostsuccessful process for that purpose is the one known as theClaude system. There is considerable machinery about sucha plant. Fig. 2, which is used as follows: Ordinary air ismade to pass through two towers of spiral tiles. Fig. ,vagainst a stream of caustic soda, which removes the to per cent of carbon dioxide from the air. Theair is then taken into the low pressure cylinder of an aircompressor, free of CO^ but saturated with moisture, whichis squeezed from it by compression to 95 lb. per sq. in. Theair goes from the low pressure cylinder to a high pressurecylinder, where it is compressed to 450 lb. per sq. in.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
