File:Cassier's magazine (1904) (14765931951).jpg

Identifier: cassiersmagazi2719041newy (find matches)
Title: Cassier's magazine
Year: 1891 (1890s)
Authors:
Subjects: Engineering
Publisher: New York Cassier Magazine Co.
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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our cylinders,arranged in double tandem order. Thehigh-pressure cylinder is 23 inches indiameter, the intermediate cylinder is34 inches in diameter, and the two low-pressure cylinders are each 42^ inchesin diameter, the stroke being 66 inches.The boiler pressure is 180 pounds, andthe economical load is 1700 I. H. P.,although upwards of 2000 I. H. P. iseasily obtained. The high and inter-mediate cylinders are steam-jacketed,and there is a reheating receiver fittedbetween them. It will be noticed thatthe cylinders are very handsomely fin-ished off by planished steel lagging withpolished corners and mouldings, andthat the whole engine bears the unmis-takable stamp of good design and con-struction. The engine frames are of the cylindri-cal trunk pattern, the material being sodisposed that all the stresses are takenup within the bed itself independentlyof the foundations, which, nevertheless,are of the most massive character. Thetwo low-pressure cylinders are directly 426 CASSIERS MAGAZINE
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THE MODERN HORIZONTAL STEAM ENGINE 427 connected to the trunk frames by steeltie rods passing on each side of thesmaller cylinders in front of them,thereby relieving the latter of all thelow pressure stresses, and permittingindependent and free expansion andcontraction in both pairs. The bearing surfaces in the shaft,crank-pins and piston-rod guides aredesigned throughout on the most liberalscale, and, as forced lubrication isadopted, it may be taken for grantedthat the wear of these important work-ing parts will be inappreciable for manyyears to come. The vertical air pumps,situated behind the low-pressure cyl- is no wrist-plate, the exhaust valvesbeing worked directly from a continuousline of eccentric rods. The admissionvalves are actuated and tripped throughthe medium of a long cast iron slippermoved by the eccentric rod and carry-ing the trip motion with it until releasedby the action of the governor. A very important detail of this engineis the knock-off appliance ; this be-come

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