Modeling of engines in clay continued to be another of his favorite occupations. He made models of engines which he had seen, and of others which were described to him. These attempts were an improvement upon his first trials at Dewley Burn bog, when occupied there as a herd-boy. He was, however, anxious to know something of the wonderful engines of Boulton and Watt, and was told that they were to be found fully described in books, which he must search for information as to their construction, action, and uses. But, alas! Stephenson could not read; he had not yet learned even his letters. Thus he shortly found, when gazing wistfully in the direction of knowledge, that to advance farther as a skilled workman, he must master this wonderful art of reading--the key to so many other arts. Only thus could he gain an access to books, the depositories of the wisdom and experience of the past. Although a grown man, and doing the work of a man, he was not ashamed to confess his ignorance, and go to school, big as he was, to learn his letters. Perhaps, too, he foresaw that, in laying out a little of his spare earnings for this purpose, he was investing money judiciously, and that, in every hour he spent at school, he was really working for better wages. His first schoolmaster was Robin Cowens, a poor teacher in the village of Walbottle. He kept a night-school, which was attended by a few of the colliers' and laborers' sons in the neighborhood. George took lessons in spelling and reading three nights in the week. Robin Cowens's teaching cost threepence a week; and though it was not very good, yet George, being hungry for knowledge and eager to acquire it, soon learned to read. He also practiced "pot-hooks," and at the age of nineteen he was proud to be able to write his own name.