At the end of the year he went to Glasgow to open a shop for himself; but other mechanics were jealous of a new-comer, and would not permit him to rent a place. A professor at the Glasgow University knew the deserving young man, and offered him a room in the college, which he gladly accepted. He and the lad who assisted him could earn only ten dollars a week, and there was little sale for the instruments after they were made: so, following the example of his first master, he began to make and mend flutes, fiddles, and guitars, though he did not know one note from another. One of his customers wanted an organ built, and at once Watt set to work to learn the theory of music. When the organ was finished, a remarkable one for those times, the young machinist had added to it several inventions of his own. This earning a living was a hard matter; but it brought energy, developed thought, and probably helped more than all else to make him famous. The world in general works no harder than circumstances compel. Poverty is no barrier to falling in love, and, poor though he was, he now married Margaret Miller, his cousin, whom he had long tenderly loved. Their home was plain and small; but she had the sweetest of dispositions, was always happy, and made his life sunny even in its darkest hours of struggling. Meantime he had made several intellectual friends in the college, one of whom talked much to him about a steam-carriage. Steam was not by any means unknown. Hero, a Greek physician who lived at Alexandria a century before the Christian era, tells how the ancients used it. Some crude engines were made in Watt's time, the best being that of Thomas Newcomen, called an atmospheric engine, and used in raising water from coal-mines. It could do comparatively little, however; and many of the mines were now useless because the water nearly drowned the miners. Watt first experimented with common vials for steam-reservoirs, and canes hollowed out for steam-pipes. For months he went on working night and day, trying new plans, testing the powers of steam, borrowing a brass syringe a foot long for his cylinder, till finally the essential principles of the steam-engine were born in his mind. He wrote to a friend, "My whole thoughts are bent on this machine. I can think of nothing else." He hired an old cellar, and for two months worked on his model. His tools were poor; his foreman died; and the engine, when completed, leaked in all parts. His old business of mending instruments had fallen off; he was badly in debt, and had no money to push forward the invention. He believed he had found the right principle; but he could not let his family starve. Sick at heart, and worn in body, he wrote: "Of all things in life there is nothing more foolish than inventing." Poor Watt!