. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . lever the motion is trans-mitted to the valve spindle by the rod center or fulcrum, F, of the lever E,partakes also of the vertical movement ofthe connecting rod to an extent equal to ventions and variations in locomotiveengine valve gearing have been made byskilled mechanicians whose experience inactual work has sharpened their intellectsand in many cases rendered the applica-tion of their theories comparatively easyby giving an opportunity in the locationswhere they were employed to t
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . lever the motion is trans-mitted to the valve spindle by the rod center or fulcrum, F, of the lever E,partakes also of the vertical movement ofthe connecting rod to an extent equal to ventions and variations in locomotiveengine valve gearing have been made byskilled mechanicians whose experience inactual work has sharpened their intellectsand in many cases rendered the applica-tion of their theories comparatively easyby giving an opportunity in the locationswhere they were employed to test themerits of their devices. David Joy, an English locomotivesuperintendent, patented a valve motionin 1879. Although belonging to the radialgear variety of valve motions, it has sev-eral features distinctively its own. Ithas neither eccentric nor crank, the valvederiving its movement from a system oflevers connected with the main rod andvaried by the application of a slidinglink. The motion for the valve is taken di-rectly from the connecting rod and byutilizing independently the backward and. FIG. 3. SECTION OF GEAR. crum, F, of the lever, E, is represented inFig. I. The shaft, L, and the links canbe partially rotated on the center of theformer, so that the slots in the links willbe inclined over to either side of a verti-cal position, as shown at JV and X. Thisis done by means of an ordinary reverselever connected to the upper arm, M,attached to the shaft, L. When the linksare thus inclined, the vertical movementof the lever, E, causes the blocks in thelinks and the center, F, to traverse a pathinclined to a vertical center line; and todiverge from it to either side. Thecenter, F, therefore, has a horizontalmovement, the extent of which dependsupon the degree of inclination of thelinks, and the direction of which is gov-erned by their position. The forward or backward motion ofthe engine is governed by giving the slotsthis inclined position on one or otherside of the vert
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