Issue 3 and Volume 61.

WATER WORKS PRACTICE Mr. T. Pridham, in a recent number of the Commonwealth-Engineer of Australia, shows a method of providing a joint in special castings for hydrants, valves and other connections that are inserted in wood stave pipe. The method consists in placing a run or ship lead joint between the wood and the iron. The water department of Springfield, Mass., has installed a plant at the filter bed for the manufacture of sulphate of aluminum since last July. The plant produces on the average about 1,000 pounds of alum a day and consists of two large iron caldrons suspended about the end of two wooden crystallizing boxes. On account of the high cost of chemicals, used in water purification, since the outbreak of the European war, a number of water plants have devised methods for making chemicals at less expense than by purchasing them from manufacturers. The chemists of…

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