. American engineer and railroad journal . e llanges of the wheels of a locomotive strike tberail on one side under tbe ioduoncc of ccntrifogal force atacurve, or o( oiovements of oscillation, tbe engine gives therail, everything bIkc being equal, a Jar which is all tbe moreviolent in proportion as ita center of gravity is lower. If wesuppose the center of gravity to be at the level of tbe rail,tbe strain duo to the centrifugal force will be entirely trans-mitted to the rail ; if tbe center of gravity were removed toan infinite distance above the permanent way. the enginewould no longer have a
. American engineer and railroad journal . e llanges of the wheels of a locomotive strike tberail on one side under tbe ioduoncc of ccntrifogal force atacurve, or o( oiovements of oscillation, tbe engine gives therail, everything bIkc being equal, a Jar which is all tbe moreviolent in proportion as ita center of gravity is lower. If wesuppose the center of gravity to be at the level of tbe rail,tbe strain duo to the centrifugal force will be entirely trans-mitted to the rail ; if tbe center of gravity were removed toan infinite distance above the permanent way. the enginewould no longer have any stability, and under the inBuenceof an inBnitelj alight contritugal force would balance itselfon the outer rail, without causing any appreciable straintending towards displacement. In practice, every engineoccupies ao intermediate position between lhesetwoeitrem«conditions, but we can alreadydraw the concluiion from theabove that the higher an engine Is the less will it tend todisplace tbe permanent way. To make it absolutely safe, we. ) New farlc Cinlral tour coupled cuBlui IBM. mllBl 18J kllomclorsl an hour. IttTblarotumiuuiigines with latoroot rTllndersj .witbexturnalcrUadus, ibe dlaiuutot r«achas 9,^ foul lUO Oivicro. Fig. 2. Front Views of an Old Crampton, an English, andan American Engine. shall only have to give it tbe niioimum stability consistentwith ita running no risk ot beiUK upset when passing nt fullspeed over curves of the smallest radius which will it haveto pass. Now experience shows that tbia limit is not ex*ceeded by tbe most lofty .-Vmericau engines. In this way the more obliquely will it act upon the railunder tbe action of the transverse strains due to oscillationor centrifugal force. But—and tbIB is the important point—as the engine is bung on tprings, the higher its center ofgravity the greater will be tbe proportion of its weightwhich will bear vertically on lis outer wheels. This de-creases tbe tendency toward derailment by l
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
