OF RAIL-ROADS.

1 k r

of the boiler. The fuel is put in at the end a, and f shewsthe depot containing the coals, constituting the supply forone trip or journey.

c is one of the cylinders affixed to the side of the boiler;immediately opposite to which, on the other side of theboiler, the other cylinder is placed. A A are two beams,fixed at one end D, upon the upright frame E E. The otherends moveable up and down, by means of the piston-rod F;the rectilinear motion, within the cylinder, is effected by theparallel motion P P, in the usual manner. The cylinder, asshewn in the drawing, is cased with wood, to prevent theradiation of heat from its exposure to the air. G G is asquare frame of wood, on which the boiler is supported, andwhich is itself supported by the upright transverse bearingsK K upon the two separate frames H H and 11. Theupright bearings, K K, are placed across the squareframes, exactly in the middle, so that each of the respec-tive pairs of wheels, on which they rest, bear equal portionsof the weight. The transverse supports, K K, are fastenedto each of the frames H II and I I, by bolts in the middle,which allow a lateral motion in the frames, to conformwith the occurrence of curvitures in the line of the road.Underneath the frame GG, and stretching across it fromone side to the other, an axle, N, is placed, upon which, ateach end, the two cranks are fixed; N M will shew oneattached to the connecting rod L M, moveable upon thebeam at L. These two cranks are placed upon the axle atright angles to each other, so that, when one is perpendi-cular the other is horizontal; thus securing the constantaction of either one or other of the cylinders upon the axle,to effect its rotatory motion.

Upon the middle of the axle on which the cranks areplaced, the continual roratory motion of which is keptup by the engine, a cog-wheel is fixed, as shewn in the