. American engineer and railroad journal . ire outfit self-contained, of per- head is of box form, with adjustable shoes and steel wrist pindrawn in on a continuous taper and securely fastened. Thecareful construction of till bearings and the methods used toinsure perfect alignment maki tin se machines remarkably smoothin operation with small friction loss. The steam valve is a balanced, double ported slide type, havingvery shorl steam ports, and is well suited to the operation of acompressor or engine, giving economical service with little atten-tion aside from lubrication. The steam cylinder
. American engineer and railroad journal . ire outfit self-contained, of per- head is of box form, with adjustable shoes and steel wrist pindrawn in on a continuous taper and securely fastened. Thecareful construction of till bearings and the methods used toinsure perfect alignment maki tin se machines remarkably smoothin operation with small friction loss. The steam valve is a balanced, double ported slide type, havingvery shorl steam ports, and is well suited to the operation of acompressor or engine, giving economical service with little atten-tion aside from lubrication. The steam cylinders are lagged withos t reduce radiation, and are covered with a heavy pol-ished blue steel jacket. The cranks of the duplex machine areprotected by a polish) d steel guard with heavy angle iron pieces,and the single crank machine may also be so fitted. The air valves, tiie vital parts of any compressor, as ordinarilyfurnished, are of the automatic, direct lift type, with springclosure, operating in guides of a recently improved form, which. nn. i.—duplex busy compressor—built with SIMPLE OR TWO-STAGE AIR AND SIMPLE or COMPOUND STEAM CYLINDERS. niatent alignment and adapted to run as satisfactorily on a goodtimber cribbing as on a more permanent foundation of concreteor brick. I le crank shafts and connecting rods are of forged openhearth steel. The crank of the duplex machines is of the builtup type, with balanced disk- forced on the shall .and held bytwo keys. The pin is forced in and riveted. The various operatiiHis in the building up of this crank are done with a care andprecision which makes the completed crank practically as solidand true as if made from one piece. The single crank shaft isslotted from a single forging, the pin and journals are turnedwith large fillet-, and the shaft is fitted with counterweighteddisks mounted on the wings of the crank by a special construc-tion, the joints being all machined and no babbitt or other softmetal likely to loosen from shrin
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
