=420. Development of English manufactures.=—It is apparent that this period was marked by a rapid development of English manufactures. Taking two manufactures, typical of an advanced industrial state, iron and cotton, we find that the increase in production is estimated at over tenfold or more than 1000 per cent; as the quantity of population had merely doubled it is apparent that its quality, or the character of its occupations, underwent a revolutionary change. It is, in fact, in this first half of the nineteenth century that the enormous possibilities latent in the inventions of the eighteenth century became apparent and were realized. The great inventions were not enough, in themselves, to transform industry. They needed to be developed by practical business men, who could secure the necessary capital to utilize them to the best advantage, who had the talent for organization enabling them to build up an efficient force of laborers, who could stimulate further technical improvements necessary to supplement the great inventions, and who could develop a mercantile system enabling them to buy and sell large quantities to good advantage. Some English manufactures remained “domestic” industries carried on in the home of the workman, but the most important advanced to the factory system, and were thus enabled to get the full advantage from technical improvements. =421. Introduction of machinery.=—It is in this period that the knowledge and experience necessary to the proper handling of machinery spread from narrow circles to broad groups of men. The market for machinery was thus established, and the manufacture of tools and machines underwent a corresponding development; in 1836 it was “difficult to point out any leading mechanical process, the details of which have not been, by this means, simplified, and the article produced brought nearer to perfection.” Inventors from other countries sought British shops to perfect their devices, and British factories in which to introduce them. Some of the best textile machinery of this period was invented in the United States and other countries, but was first put to practical use in England. =422. Steam power and railroad transportation.=—It is in this period, also, that the steam-engine became a practical force in English manufactures. The steam-engine had been introduced in Birmingham in 1780, but the number of engines in that rising center of manufactures was in 1815 only 42 and in 1830 still only 120, while in the nine years following the number rose to 240, or doubled. In 1835 the textile factories of England employed only a little over 50,000 mechanical horse-power, and of this total nearly a quarter was still obtained from water-wheels. The beginnings of transportation by steam railroads can be dated, as said before, from about 1830.