. American ENGINEER and Railroad journal . HE friction est réengagé. Le changement est performecomme suit: L'arbre inférieur qui est en acier de l'outil, est fait avec un en-largissement à environ le centre, dont l'élargissement est biseausur les deux bords et est fourni avec l'outil-clés de ressort en acier pour l'embrayage dans les sièges coupés dans les alésages des pignons libres. Le mouvement latéral de l'agrandissement, N, de l'arbre inférieur impartmouvement vertical vers les engrenages qui s'engrènent et les désengrènent de leurs contraintes au-dessus lorsqu'il passe à travers leurs alésages. Ce mouvement Lateralmotion est incliné vers l'arbre inférieur par un bâti de crémaillère

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. American engineer and railroad journal . he friction is re-engaged. The changing is performedas follows: The lower shaft which is of tool steel, is made with an en-largement at about the center, which enlargement is beveledat both edges and is provided with tool-steel spring keys toclutch into the seats cut into the bores of the loose gears. Thelateral motion of the enlargement, N, of the lower shaft impartsvertical motion to the gears meshing and unmeshing them fromtheir mates above as it passes through their bores. This lateralmotion is imparted to the lower shaft through a rack sleevecut on it at the right-hand end, and a gear meshing therewith, which receives the ball seated lever, L. This lever carries a b8 AMERICAN ENGINEER AND RAILROAD JOURNAL. hand wheel, which can be arranged either above or below thei-asings as is shown by the clotted lines. The gears on the upper shaft, with the exception of the smallpinion, G, turned on shaft A is controlled by the frictionclutch, K. which as operated by lever, L, on shaft, A. The. SECTION X-Y FIG. 5S.—CBOfeS ami L0NGTT1 lilNAI. SECTIONS OP Till NEW SCHEIAENBACH SPEED-CHANGING MECHANISM, SHOWTNG MODE OF OPERATION, AND DETAIL OF CAM, M. largest gear of the lower cone is always in mesh with gear, G, and transmits the slowest speed to the lower shaft by a ratchetdevice, the pawls of which are carried by it. The ratchet, whichis really a part of the lower shaft, will always revolve fasterthan the pawls, when any speed higher thin the slowest is usedand will thus be running idly at those times, but the momentthat friction clutch, K, is released by lever, L, however, thelower shaft will slow down until it reaches a speed equal tothat of the pawls. The pawls are automatically reversible sothat they will be effective when running in either direction. When friction, K, is engaged the lower portion of the yokeY, which operates the cone, rests directly on the top of plug, P, the lower end of which is beveled to fit into the notche

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