. Locomotive engineering : a practical journal of railway motive power and rolling stock . Floor „.„ t„» i™„l,.«-,m,; Floor Fig. 4 E X, and find it is f^ inch. Now, remem-ber this J4 inch is very important; it isthe amount of angular advance we mustgive to the eccentrics. We now take a wooden parallel straight-edge S S, Fig. 4; mark a line A with asharp pencil, and call it center line of ; then we caliper axle (between or neareccentrics), and half of that we layout fromA to B and call it outside line of axle S;then we caliper diameter of eccentric,and half of that we lay out from A
. Locomotive engineering : a practical journal of railway motive power and rolling stock . Floor „.„ t„» i™„l,.«-,m,; Floor Fig. 4 E X, and find it is f^ inch. Now, remem-ber this J4 inch is very important; it isthe amount of angular advance we mustgive to the eccentrics. We now take a wooden parallel straight-edge S S, Fig. 4; mark a line A with asharp pencil, and call it center line of ; then we caliper axle (between or neareccentrics), and half of that we layout fromA to B and call it outside line of axle S;then we caliper diameter of eccentric,and half of that we lay out from A to Cand call it eccentric line C; and then welay out ^ inch from C to D, and this isthe advance. MainDrivingWheels. Fig. I now in central position, and we seeA A A A all come in one line, and for thisreason we call it a straight-in-line engine. We now put on the alligator plate A, asshown in Fig. ^. The plate is made sothat the jaws 5 5 are equal distance fromcenter line B B. The opening is put oncrank pin X; the 3-16 set screw D isslightly screwed up, and the plate A isthen raised to the fine center mark ofaxle P, and then clamped on tire with asmall wooden clamp C. We then turnthe wheel until plate A is level, and in thisway we will have the crank pin X on itsexact dead center, the same as it would bewhen under the engine. Now we measure valve, and we findthat it has ^-inch lap, and we are told togive i-16-inch lead. We are working on the left-hand side,and we now look after the left siderocker arm A\ Fig. i. We find that itis a straight-in-line one; but the upperarm is 10 inches from its center .4, andthe lower one is only 95^2 inches from thecenter, a diflference of yi inch, and in thiscase we
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroa, bookyear1892
