. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . e valve stem leading to the reversal of motion of the locomo-tive is obtained by the bell crank A-Coperated by means of reach rod points 1and 3 are relative position for backwardmotion and 2 and 4 for forward center of return crank is located180° to rear of crank pin. The reverseshaft B connects both to sides of the lo-comotive, as in ordinary construction, butis supported directly on the top of thedriving boxes by means of rods G-G soas to be independent of the frame. Th
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . e valve stem leading to the reversal of motion of the locomo-tive is obtained by the bell crank A-Coperated by means of reach rod points 1and 3 are relative position for backwardmotion and 2 and 4 for forward center of return crank is located180° to rear of crank pin. The reverseshaft B connects both to sides of the lo-comotive, as in ordinary construction, butis supported directly on the top of thedriving boxes by means of rods G-G soas to be independent of the frame. Therods are guided by thimbles H H con-nected to frame and kept in proper ten-tion by spring J. The gear can be designed for any de-sired lap or lead by proportioning theparts E and K of floating lever or ec-centric according to well known princi-ple E : K :: Diameter of Return crankcircle 2 x (Top plus Lead). An analysis of the gear showing the well known valve small locomotive use are self-evident,ellipse would show with a H lap and Vi. The inside admission gear is shown for Travel Full Gear 3* r. [ r KINEMATIC DIAGRAM, O. K. LOCOMOTIVE VALVE GEAR INSIDE ADMISSION,The sketch shows the gear in mid- The length of the various arms can be gear. The possibilities of this gear for adjusted to suit any condition desired. It will also be observed at a glance thatthe parts are few in number, and theweight of the gearing is lighter than anyother kind of valve gear used on loco-motives. Its adoption would lessen to aconsiderable extent the cost of valve gearson the modern locomotive, which is agrowing item in the original as well as inthe maintenance cost, which with a num-ber of parts and bearings are constantlyin need of repair. The reports fromGermany, in regard to the gear, althoughsomewhat meagre, are of the most en-couraging kind, and it seems is if its gen-eral use there is already foreshadowed. J J- October, 1915. RAILWAY AND LOCOMOTIVE ENGINEERING. 331 Air Brake Testing Device B
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