Pumping machinery is no longer dependent upon water or coal for its motive power. The use of electricity, gas and gasolene has been effectively invoked in that line, and that of gas and gasolene engines is now quite common. One style of gas and gasolene engine, the Nash, illustrated in this article, is of the inclosed, vertical type, in which the crank and its hearings, the gears, and the connecting rod and its bearing are inclosed in a tight case, which contains the lubricating oil. This insures perfect lubrication of all the working parts. The pillow blocks in the large engines are so designed that the brasses can be easily removed, if this should become necessary. The brasses are made of phosphor-bronze, and are accurately turned, after which the bearings are scraped to fit them. The two brasses do not quite complete the circle, and the blank space thus formed on each side is filled with thin sheet steel shims. When it is desirable to take up wear, the cap-nuts are taken off, and the cap and upper brass are removed. The shaft can now be raised a trifle—1.32 of an inch is ample—when the lower brass can be readily turned roung the shaft and lifted out. After the requisite number of shims have been removed, the cap is replaced. It may be interesting to give some data in regard to the actual cost of running one of these installations—the figures being taken from the actual performance of engines in service. In everyday boiler practice a pound of steam is obtained from 1,600 to 1,800 heat-units in the coal, and, in some cases, this amount will be increased to 2,000 heatunits. Such gas will cost from ten to twenty-five cents per 1,000 cubic feet, and power will cost about 1.3 of a cent per brake-horsepower an hour. With ordinary city gas, costing from $1 to $1.25 and containing 630 heat-units, the cost per brakehorsepower per hour will be about two cents. Several waterworks plants have been equipped with Nash gas engines, and this type of machine is well adapted for pumping water supplies, inasmuch as it is so economical in its operation. Some are used in Long Island, N. Y., in connection with Acme water storage system, and are also installed in Western waterworks. They are installed by the National Meter company, 84-86 Chambers street, Manhattan, New York!



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