132 MOTIVE POWER AND DISPOSITION

without the aid of the adhesion of the wheelsupon the rail, and of which, as it displays greatingenuity, 1 have given a drawing.

Fig. IF. Plate IV. is a side-view of the engine. The boilerwas nearly similar to that of Mr. Blenkinsop, semicircular;there was a tube passing through it, to contain the fuel. Thecylinder A was placed on one side of the boiler; the piston-rod is projected out behind horizontally, and is attached tothe leg a 6 at a, and to the reciprocating lever a c, which isfixed at c; at the lower extremity of the leg a b, feet areattached, by a joint at b; these feet lay a firmer hold uponthe ground, being furnished with short prongs, which pre-vent them from slipping, and are sufficiently broad to pre-vent their injuring the road.

On inspecting the drawing, it will be seen that when thepiston-rod is projected out from the cylinder, it will tend topush the end of the lever, or leg a, from it, in a directionparallel to the line of the cylinder; but as the leg a 6 is pre-vented from moving backwards, by the end b being firmlyfixed upon the ground, the reaction is thrown upon the car-riage, and a progressive motion given to it, and this will becontinued to the end of the stroke. Upon the reciprocatingline a c is fixed at 1. a rod, 1.2. 3., sliding horizontally

backwards and forwards upon tbc top of tbc boilor ; from 2

to 3 it is furnished with teeth, which work into a cog-wheel, lying horizontally: on the opposite side of thiscog-wheel a sliding-rack is fixed, similar to 1.2. 3. which,as the cog-wheel is turned round by the sliding rack2. 3. is also moved backwards and forwards. The endof this sliding rod is fixed upon the reciprocating leverd c of the leg d e, at 4. When, therefore,’ the sliding rackis moved forwards in the direction 3.2.1. by the pro-gressive motion of the engine, the opposite rod, 4, is