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Treated Water for Locomotives.--From a bulletin of the Canadian National Railways we learn that the natural waters of the prairie country contain sufficient hardness to make necessary the installation of treating plants wherever it is to be used in locomotive boilers. The treatment consists of removing from the water certain dissolved salts such as sulfate of lime, carbonate of lime and carbonate of magnesia. The combined concentration of these mineral salts may amount to 50o parts per million or more and if they are left in the boiler water, evaporation causes a deposition of these salts upon the tubes and other heating surfaces in the form of a hard, dense and heat-resistant scale. A locomotive, such as the 6Ioo type, uses about x4,ooo gallons of water on an average run of I85 miles and if the water were not previously treated, scale formation would rapidly reach serious proportions.
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