. The railroad and engineering journal . l public opinion orconsent, as soon as the advantages of his scheme become gen- 440 THE RAILROAD AND [September, 1889. erally understood. For ladies, of course, no change of dresswill be required. An English Launch Engine.—The accompanying illusiralion sliows a engine intended for a steamlaunch 50 ft. long and , which is exhibited at the ParisExposition by Simpson, Strickland iS; Company, of Dartmouth,England. The boiler is intended to carry a working pressure of175 lbs. The engine, which can about 40 has cylin-
. The railroad and engineering journal . l public opinion orconsent, as soon as the advantages of his scheme become gen- 440 THE RAILROAD AND [September, 1889. erally understood. For ladies, of course, no change of dresswill be required. An English Launch Engine.—The accompanying illusiralion sliows a engine intended for a steamlaunch 50 ft. long and , which is exhibited at the ParisExposition by Simpson, Strickland iS; Company, of Dartmouth,England. The boiler is intended to carry a working pressure of175 lbs. The engine, which can about 40 has cylin-ders 3i in., 5j in., S in., and 12 in. diameter, with OJ in. stroke,and is arranged on the tandem type. As will be seen from ourillustration, the engine cylinders, which are lagged with leak,are supported on wrought-iron front columns, and a casting atthe back on which the guides are formed. The engineMsfittedwith coupling and link-motion, all working partsbeing feed and air pumps are driven direct from_the crosshead ^m^%M. of the engine, without the intervention of levers or weight-shafts, and are attached immediately at the back of the webframing. These pumps are constructed entirely of gun metal,and are especially designed to work at as high a speed as 400to 500 revolutions per minute. The bottom valve of the feed-pump is formed with a long spindle, made a working fit in ahole bored in the pump-plunger. The spindle, becoming coatedwith grease from the condensed water, causes sufficient frictionto lift the valve at the commencement of the upstroke of theplunger, and keeps it open .during the stroke, thus leavi ng a freepassage for the water. At the commencement of the down-stroke the friction causes the valve to close immediately, and itis in consequence of this arrangement that the pump can workat so high a speed. The bottom valve of the air pump is madein the piston, which is allowed a small amount of vertical motionon the piston rod, and is so arranged that,
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectrailroa, bookyear1887
