After making a careful study of what had been done by others, George Stephenson came to the conclusion that he could improve upon the existing locomotive models. This was about 1813, when he was about thirty-four years old. He said to his friends that "there was no limit to the speed of such an engine, if the works could be made to stand." One of his employers, Lord Ravensworth, advanced the necessary money for constructing his first "Traveling Engine" at West Moor, the colliery blacksmith undertaking to carry out his designs. Dr. Smiles's description of this locomotive may be reproduced: "The boiler was cylindrical of wrought iron, eight feet in length and thirty-four inches in diameter, with an internal flue tube twenty inches wide passing through it. The engine had two vertical cylinders of eight inches diameter and two feet stroke let into the boiler, working the propelling gear with cross heads and connecting rods. The power of the two cylinders was combined by means of spur-wheels which communicated the motive power to the wheels supporting the engine on the rail. . . The engine thus worked upon what is termed the second motion. The chimney was of wrought iron, round which was a chamber extending back to the feed pumps, for the purpose of heating the water previous to the injection into the boiler. The engine had no springs, and was mounted on a wooden frame supported on four wheels." The engine made its trial trip July 25, 1814, on which occasion it showed a speed of four miles an hour in drawing a load of thirty tons. This engine was named "Blucher," after the distinguished Prussian field-marshal. Blucher was almost immediately improved by its inventor. First he doubled the steam-making power of its boiler by turning the exhaust from the cylinders into the smoke-stack, thus creating a forced draught. Second he built another engine, in which the tooth-wheel driving gear gave way to a simple and direct connection between the piston and the driving wheels which rolled upon the rails. This type of locomotive, developing some six miles an hour, did its work so well in the colliery that it was retained, with very slight alterations, for more than half a century. The report of its success got abroad slowly, and Mr. Stephenson was commissioned to build a railway and a number of locomotives for a colliery in another shire. The success of this piece of engineering encouraged him in sending his son Robert, a youth of fine promise, to Edinburgh to study physical sciences in the university, where in his brief residence he took a mathematical prize.