. Locomotive engineering : a practical journal of railway motive power and rolling stock . would still be in the same position,as seen in Fig. 3. In order to get this pinin the same position occupied by the right-hand pin before turning took place, itmust be advanced one-quarter of a turn,as shown in Fig. 4, and what was theoriginal right-hand pin in Fig. 2 is nowthe left-hand pin shown in Fig. 3, sinceeach pin must move through an angle ofgo degrees in changing position by rota-tion. What effect this transfer of wheels hason the eccentrics may now be noted. InFig. I the go-ahead eccentric is
. Locomotive engineering : a practical journal of railway motive power and rolling stock . would still be in the same position,as seen in Fig. 3. In order to get this pinin the same position occupied by the right-hand pin before turning took place, itmust be advanced one-quarter of a turn,as shown in Fig. 4, and what was theoriginal right-hand pin in Fig. 2 is nowthe left-hand pin shown in Fig. 3, sinceeach pin must move through an angle ofgo degrees in changing position by rota-tion. What effect this transfer of wheels hason the eccentrics may now be noted. InFig. I the go-ahead eccentric is indicatedby the letter F and the back-up eccentricby the letter B, and it is seen by a refer- ence to Fig. 2 that in the transfer fromright to left, the eccentric marked F isnow ahead of the pin instead of back of it,as in Fig. i, and is so found in Figs. 3 and4, but this reversal of eccentrics will not tion to the pins as they did before theaxle was turned. This is seen by compar-ing Figs. I and 4; the engine, therefore,will run just the same as before the axlewa; turned end for Locomotlw EngtaeeringEFFECT OP CHANGING DRIVERS END TOR END. introduce any distortion in the valvemovement when the go-ahead rod iscoupled up to eccentric B, and the back-up to eccentric F, for the reason that theeccentric centers stand in the same reia- What the effect will be when the centerline of motion is not coincident with thecenter of the cylinder will next be consid-ered. In Fig. 5 the center line of motionis shown more nearly in accord with con- S4 LOCOMOTIVE ENGINEERING February, iS dilions obtaining in locomotive practice,but exaggerated, to make it plain. LineA shows at an angle with the center lineof crank, which is assumed to be left sideon forward center, and since the eccentriccenters must be perpendicular to line A,it follows that the eccentrics will have anew location as shown by their centerswhich ai-e designated by the same lettersas in the other figures. On turning Fig. 5 fr
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