George Stephenson had now acquired the character of an expert workman. He was diligent and observant while at work, and sober and studious when the day's work was done. His friend Coe described him to the author as "a standing example of manly character." On pay-Saturday afternoons, when the pitmen held their fortnightly holiday, occupying themselves chiefly in cock-fighting and dog-fighting in the adjoining fields, followed by adjournments to the "yel-house," George was accustomed to take his engine to pieces, for the purpose of obtaining "insight," and he cleaned all the parts and put the machine in thorough working order before leaving her. His amusements continued to be principally of the athletic kind, and he found few that could beat him at lifting heavy weights, leaping, and throwing the hammer. In the evenings he improved himself in the arts of reading and writing, and occasionally he took a turn at modeling. It was at Callerton, his son Robert informed us, that he began to try his hand at original invention, and for some time he applied his attention to a machine of the nature of an engine-brake, which reversed itself by its own action. But nothing came of the contrivance, and it was eventually thrown aside as useless. Yet not altogether so; for even the highest skill must undergo the inevitable discipline of experiment, and submit to the wholesome correction of occasional failure. After working at Callerton for about two years, Stephenson received an offer to take charge of the engine on Willington Ballast Hill at an advanced wage. He determined to accept it, and at the same time to marry Fanny Henderson, and begin housekeeping on his own account. Though he was only twenty-one years old, he had contrived, by thrift, steadiness, and industry, to save as much money as enabled him, with the help of Fanny's small hoard, to take a cottage dwelling at Willington Quay, and furnish it in a humble but comfortable style for the reception of his bride. Willington Quay lies on the north bank of the Tyne, about six miles below Newcastle. It consists of a line of houses straggling along the river side, and high behind it towers up the huge mound of ballast emptied out of the ships which resort to the quay for their cargoes of coal for the London market. The ballast is thrown out of the ships' holds into wagons laid alongside. When filled, a train of these is dragged to the summit of the Ballast Hill, where they are run out, and their contents emptied on to the monstrous accumulation of earth, chalk, and Thames mud already laid there, probably to form a puzzle for future antiquaries and geologists when the origin of these immense hills along the Tyne has been forgotten. At the foot of this great mound of shot rubbish was a fixed engine, which drew the trains of laden wagons up the incline by means of ropes working over pulleys, and of this engine George Stephenson acted as brakesman.