Although the locomotive seemed about to be lost sight of, it was not forgotten. In 1811, Mr. Blenkinsop, the manager of the Middleton Collieries, near Leeds, revived the idea of employing it in lieu of horses to haul the coals along his tram-way. Mr. Blenkinsop, in the patent which he took out for his proposed engine, followed in many respects the design of Trevithick; but, with the help of Matthew Murray, of Leeds, one of the most ingenious mechanics of his day, he introduced several important and valuable modifications. Thus he employed two cylinders of 8 in. diameter instead of one, as in Trevithick's engine. These cylinders were placed vertically, and immersed for more than half their length in the steam space of the boiler. The eduction pipes met in a single tube at the top, and threw the steam into the air. The boiler was cylindrical in form, but of cast iron. It had one flue, the fire being at one end and the chimney at the other. The engine was supported on a carriage without springs, resting directly upon two pairs of wheels and axles unconnected with the working parts, and which merely served to carry the engine upon the rails. The motion was effected in this way: the piston-rods, by means of cross-heads, worked the connecting-rods, which came down to two cranks on each side below the boiler, placed at right angles in order to pass their centres with certainty. These cranks worked two shafts fixed across the engine, on which were small-toothed wheels working into a larger one between them; and on the axis of this large wheel, outside the framing, were the driving-wheels, one of which was toothed, and worked into a rack on one side of the railway.