Soon after this, Watt invented the letter-copying press, which at first was greatly opposed, because it was thought that forged names and letters would result. After a time, however, there was great demand for it. Watt was urged by Boulton to invent a rotary engine; but this was finally done by their head workman, William Murdock, the inventor of lighting by gas. He also made the first model of a locomotive, which frightened the village preacher nearly out of his senses, as it came puffing down the street one evening. Though devoted to his employers, sometimes working all night for them, they counselled him to give up all thought about his locomotive, lest by developing it he might in time withdraw from their firm. Alas for the selfishness of human nature! He was never made a partner, and, though he thought out many inventions after his day's work was done, he remained faithful to their service till the end of his life. Mr. Buckle tells this good story of Murdock. Having found that fish-skins could be used instead of isinglass, he came to London to inform the brewers, and took board in a handsome house. Fancying himself in his laboratory, he went on with his experiments. Imagine the horror of the landlady when she entered his room, and found her elegant wall-paper covered with wet fish-skins, hung up to dry! The inventor took an immediate departure with his skins. When the rotary engine was finished, the partners sought to obtain a charter, when lo! The millers and mealmen all opposed it, because, said they, "If flour is ground by steam, the wind and water-mills will stop, and men will be thrown out of work." Boulton and Watt viewed with contempt this new obstacle of ignorance. "Carry out this argument," said the former, "and we must annihilate water-mills themselves, and go back again to the grinding of corn by hand labor." Presently a large mill was burned by incendiaries, with a loss of fifty thousand dollars. Watt about this time invented his "Parallel Motion," and the Governor, for regulating the speed of the engine. Large orders began to come in, even from America and the West Indies; but not till they had expended two hundred thousand dollars were there any profits. Times were brightening for the hard-working inventor. He lost his despondency, and did not long for death, as he had previously.