. American engineer and railroad journal . and Xequals Pa b W. As the body is symmetrical, the center of gravity must be inthe central axis c-d and at the Intersection with the verticalthrough y, at a distance X from B, or at O. This may be laidoff graphically or it may be calculated by similar triangles. The reproduced photograph. Fig. 3, illustrates the applicationof this principle to locomotives. The engine was first care-fully weighed on the track scales, with a certain height of wa-ter, etc., and was backed off the scales. The rail was then re-moved from the narrow side of the scale platf
. American engineer and railroad journal . and Xequals Pa b W. As the body is symmetrical, the center of gravity must be inthe central axis c-d and at the Intersection with the verticalthrough y, at a distance X from B, or at O. This may be laidoff graphically or it may be calculated by similar triangles. The reproduced photograph. Fig. 3, illustrates the applicationof this principle to locomotives. The engine was first care-fully weighed on the track scales, with a certain height of wa-ter, etc., and was backed off the scales. The rail was then re-moved from the narrow side of the scale platform, and blockslaid close together, like ties from the outer frame to the fixedor dead rail support, care being taken to see that the portionof the scale under these blocks was entirely free. A rail waslaid to gauge on these blocks, and a slope prepared at one was now ready, and the beam being balanced, the waterwas brought to the same level as before in the boiler, and theengine run upon the new track, and the load upon the lower. Fig. Way to Locate the Height of the Center of Cravltyof a Locomotive. rail weighed. While the engine is upon the scales, a levelshould be run from rail to rail to determine the exact differ-ence of level for use in making the calculations; in the caseillustrated this was about 7% Inches. Of course, there Is aslight error, due to shifting of the water sidewise in the boiler,which tends to exaggerate the result. The frames should beblocked over the boxes, so that the boiler will stand relativelyto the wheels the same as on level track. If care be taken, accurate results may be obtained, as withthe small elevation mentioned, an Increase In weight of 25,00fpounds on the lower side of the engine was shown by the scales,the total weight of the locomotive being about 140,000 pounds. 320 AMERICAN ENGINEER AND RAILROAD JOURNAL.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
