. Locomotive engineering : a practical journal of railway motive power and rolling stock . e tractive force is 284 < no — 3500 ,„ ,( - X 9-68 = pounds. At point 4 the tractive force is 284 X 81 - 1900 6 - X =6,595 pounds. At point 5 the tractive force is284 X 56 36 X 12. = 5,3»o pounds. down in Fig. 2, and do not need any ex-planation till we come to point 6, wherethe inertia force is subtracted from thetractive, leaving only 1,100 pounds that iseffective in propelling the engine ahead,hence the line from point 6 is run 1,100ahead of the vertical center line. At point7 the tracti
. Locomotive engineering : a practical journal of railway motive power and rolling stock . e tractive force is 284 < no — 3500 ,„ ,( - X 9-68 = pounds. At point 4 the tractive force is 284 X 81 - 1900 6 - X =6,595 pounds. At point 5 the tractive force is284 X 56 36 X 12. = 5,3»o pounds. down in Fig. 2, and do not need any ex-planation till we come to point 6, wherethe inertia force is subtracted from thetractive, leaving only 1,100 pounds that iseffective in propelling the engine ahead,hence the line from point 6 is run 1,100ahead of the vertical center line. At point7 the traction is but 450 pounds, and issubtracted from the inertia force as shownby the reference line just above and tothe right of point 7. At points 8 and 9 thepressure is on the back side of the piston,and therefore the tractive force is nega-tive and must be added to the inertia, asshown at these points on the completes the back stroke. The for-ward stroke will be just as efficient in pro-pelling the train, but it has a very differentappearance when laid off on the 5 5300 lbs Locomotive Engineering Fig. 2 ACTION OF INERTIA AND STEAM FORCES. At point 6 the tractive force is284 X 35 36 X — 1,900 = pounds. At point 7 the tractive force is284 X 6 36 - X 9-68 = 450 pounds. At point 8 the tractive force is 284 X 40—-— X = 2 250 pc unds. At point 9 the tractive force is284 X 75 36 X 3-75 = 2,250 pounds. The above values have all been laid This is caused by the fact that in the firstquarter (from zero to point 5) the tractiveand inertia forces both act in the same di-rection. In the second they are mixed,part of the time the tractive is one way,then the other. In the third they are op-pi ite, while in the fourth they are bothahead till the tractive becomes tracing the second stroke point 11corresponds to point 1 in the first, andtin same distances are laid off all thev\ay around in the second stroke as theyare in the fi
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