. American engineer and railroad journal . given absolutely no trouble, andthe results, so far, are very favorable. The packing is in theform of L rings, with a separate bull ring, such as has beenused before. In the photograph a small pipe is seen comingfrom under the boiler jacket and leading to the top of the casingof the extended piston rod. This is to lubricate the extendedrod, and oil is fed to the pipe from an independent sight-feedlubricator in the cab. The two small brass plugs in the sideof the piston valve casing cover holes through which the edgesof the valves and ports may be seen
. American engineer and railroad journal . given absolutely no trouble, andthe results, so far, are very favorable. The packing is in theform of L rings, with a separate bull ring, such as has beenused before. In the photograph a small pipe is seen comingfrom under the boiler jacket and leading to the top of the casingof the extended piston rod. This is to lubricate the extendedrod, and oil is fed to the pipe from an independent sight-feedlubricator in the cab. The two small brass plugs in the sideof the piston valve casing cover holes through which the edgesof the valves and ports may be seen while setting the valvesand without taking the heads down. They are also usefulin cleaning the cores at this particular part of the casting, butin the shops it is so easy to take the heads down that theyare not necessary in the original setting of the valves or inputting them in order when the facilities for doing so are athand. The piston valve casing has two relief valves, also AMERICAN ENGINEER AND RAILROAD JOURNAL. 38?. Ten-Wheel Compound Freight Locomotive, Northern Pacific liOVKLL, Super intendent 0/ Motive Power. ScnESECTADT Locomotive Workb, Builders. shown in the photograph. These afford relief to the pistonvalve in case water should be forced into the valve, and theyperform the relief that is had by the lifting of the ordinaryslide valve. This result has been obtained in England by pro-viding relief through segmental packing rings, which willcompress and allow the water to pass through into the ex-haust, but on the Northern Pacific engines no working partsare added to the valves themselves to rid them of water. The driving-wheel brakes are applied to the rear sides ofthe driving wheels, a practice which should become generalbecause of the relief to the spring rigging, through the changeof the brake shoe thrusts from a downward to an upward di-rection. When placed back of the wheels the application ofthe braker tends to reduce the load on the
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
