Among his various speculations while at Willington, he tried to discover a means of Perpetual Motion. Although he failed, as so many others had done before him, the very efforts he made tended to whet his inventive faculties and to call forth his dormant powers. He actually went so far as to construct the model of a machine for the purpose. It consisted of a wooden wheel, the periphery of which was furnished with glass tubes filled with quicksilver; as the wheel rotated, the quicksilver poured itself down into the lower tubes, and thus a sort of self-acting motion was kept up in the apparatus, which, however, did not prove to be perpetual. Where he had first obtained the idea of this machine—whether from conversation, or reading, or his own thoughts, is not known; but his son Robert was of opinion that he had heard of an apparatus of this kind as described in the "History of Inventions." As he had then no access to books, and, indeed, could scarcely yet read, it is probable that he had been told of the invention, and set about testing its value according to his own methods.

Much of his spare time continued to be occupied by labor more immediately profitable, regarded in a pecuniary point of view. In the evenings, after his day's labor at his engine, he would occasionally employ himself for a few hours in casting ballast out of the collier ships, by which means he was enabled to earn a few shillings weekly. Mr. William Fairbairn, of Manchester, has informed the author that, while Stephenson was employed at the Willington Ballast Hill, he himself was working in the neighborhood as an engine apprentice at the Percy Main Colliery. He was very fond of George, who was a fine, hearty fellow, besides being a capital workman. In the summer evenings young Fairbairn was accustomed to go down to Willington to see his friend, and on such occasions he would frequently take charge of George's engine for a few hours, to enable him to take a two or three hours' turn at heaving ballast out of the ships' holds. It is pleasant to think of the future President of the British Association thus helping the future Railway Engineer to earn a few extra shillings by overwork in the evenings, at a time when both occupied the rank but of humble working men in an obscure northern village.

Mr. Fairbairn was also a frequent visitor at George's cottage on the Quay, where, though there was no luxury, there was comfort, cleanness, and a pervading spirit of industry. Even at home George was never for a moment idle. When there was no ballast to heave, he took in shoes to mend; and from mending he proceeded to making them, as well as shoe-lasts, in which he was admitted to be very expert. William Coe, who continued to live at Willington in 1851, informed the author that he bought a pair of shoes from George Stephenson for 7s. 6d., and he remembered that they were a capital fit, and wore very well.

But an accident occurred in Stephenson's household about this time which had the effect of directing his industry into a new and still more profitable channel. The cottage chimney took fire one day in his absence, when the alarmed neighbors, rushing in, threw quantities of water upon the flames; and some, in their zeal, even mounted the ridge of the house, and poured buckets of water down the chimney. The fire was soon put out, but the house was thoroughly soaked. When George came home, he found the water running out of the door, every thing in disorder, and his new furniture covered with soot. The eight-day clock, which hung against the wall—one of the most highly-prized articles in the house—was seriously damaged by the steam with which the room had been filled. Its wheels were so clogged by the dust and soot that it was brought to a complete stand-still.

George was advised to send the article to the clock-maker, but that would cost money; and he declared that he would repair it himself—at least he would try. The clock was accordingly taken to pieces and cleaned; the tools which he had been accumulating for the purpose of constructing his Perpetual Motion machine readily enabled him to do this, and he succeeded so well that, shortly after, the neighbors sent him their clocks to clean, and he soon became one of the most expert clock-cleaners in the neighborhood.

It was while living at Willington Quay that George Stephenson's only son was born on the 16th of October, 1803.[23] The child was from the first, as may well be imagined, a great favorite with his father, and added much to the happiness of his evening hours. George Stephenson's strong "philoprogenitiveness," as phrenologists call it, had in his boyhood expended itself on birds, and dogs, and rabbits, and even on the poor old gin-horses which he had driven at the Callerton Pit, and now he found in his child a more genial object for the exercise of his affection.

The christening of the boy took place in the school-house at Wallsend, the old parish church being at the time in so dilapidated a condition from the "creeping" or subsidence of the ground, consequent upon the excavation of the coal, that it was considered dangerous to enter it.[24] On this occasion, Robert Gray and Anne Henderson, who had officiated as brideman and bridemaid at the wedding, came over again to Willington, and stood godfather and godmother to little Robert, as the child was named, after his grandfather.

After working for about three years as a brakesman at the Willington machine, George Stephenson was induced to leave his situation there for a similar one at the West Moor Colliery, Killingworth. It was not without considerable persuasion that he was induced to leave the Quay, as he knew that he should thereby give up the chance of earning extra money by casting ballast from the keels. At last, however, he consented, in the hope of making up the loss in some other way.

The village of Killingworth lies about seven miles north of Newcastle, and is one of the best-known collieries in that neighborhood. The workings of the coal are of vast extent, and give employment to a large number of work-people. To this place Stephenson first came as a brakesman about the end of 1804. He had not been long in his new home ere his wife died of consumption, leaving him with his only child Robert. George deeply felt the loss, for his wife and he had been very happy together. Their lot had been sweetened by daily successful toil. George had been hard-working, and his wife had made his hearth so bright and his home so snug, that no attraction could draw him from her side in the evening hours. But this domestic happiness was all to pass away, and the bereaved husband felt for a time as one that had thenceforth to tread the journey of life alone.