. Locomotive engineering : a practical journal of railway motive power and rolling stock . e cylinders. Then, they sprnetimeshave altogether too much spring to them,and wear the cylinders unnecessarily. Alittle attention to these points will givemuch better results and save money to theroads. There is another point, too—the rebor-ing of cylinders to any old size, instead ofhaving a standard for rebored could be made Yi inch larger thanoriginal size in most cases. In manyshops, however, the cost of reboring andfitting new piston -head comes so near thecost of a new cylinder from
. Locomotive engineering : a practical journal of railway motive power and rolling stock . e cylinders. Then, they sprnetimeshave altogether too much spring to them,and wear the cylinders unnecessarily. Alittle attention to these points will givemuch better results and save money to theroads. There is another point, too—the rebor-ing of cylinders to any old size, instead ofhaving a standard for rebored could be made Yi inch larger thanoriginal size in most cases. In manyshops, however, the cost of reboring andfitting new piston -head comes so near thecost of a new cylinder from the makersthat the old ones can be scrapped to ad-vantage. Fred G. Hartman. Corning, N. Y. i Breakage of Air Pumps Valvei. Editor: Referring to Question 121, it is true thatwith the 8-inch pump it is the lower dis-charge valve that breaks most frequently,and that it is the upper discharge valvewith the 95^-inch. As you suggest, thecause is undoubtedly the greater amountof oil that reaches the valves in questionover that going to the others. After the initial failure, a repetition not. LawiHOtivt Engine4ri»ji A patented br.\ke gear for hopper-bottom cars. or avoid the two stops for turning up anddown the valve handles, few or none ofthe valves were used, hand brakes beingemployed instead. The stop necessitatedat the foot of grade is dangerous wherethere is a closely following train. As aresult, the Western road has almost com-pleted the change back to the standard lo-cation. Concerning the making up of time lost infrequently results from the new valvehaving no contact with the seat except atthe outer edge. When replacing valves, the seats shouldbe brought to the standard bevel of 45 de-grees and the valve ground to a full bear-ing, thus reducing the rapidity of wear anddecreasing the liability of breakage. F. B. Farmer. St. Paul, Minn. October, igoo. LOCOMOTIVE ENGINEERING 445 QUESTIONS AND ANSWERS On Air Brake Subjects. (123) G. U. E., Taunton. Mass., writes;In September num
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroa, bookyear1892
