Watt's steam engine came to be used for power-loom weaving and then for all sorts of manufactures. It would put England ahead of every manufacturing country in the world. Millwrights built, installed, and later designed not only steam engines but the machinery that they drove. These men were essential in setting up the first factories. They were the most imaginative and resourceful craftsmen. They knew how to use a turner's, a carpenter's and a blacksmith's tools and had supervised or done smith work, brick-laying or stone-mason's work in erecting and maintaining windmills with their many gears and bearings. There was a good deal of variety in mills, as well as in the structure and workmanship of them, some being worked by horses, some by wind, and others by water. They had some knowledge of arithmetic and practical mechanics. They could draw out a plan and calculate the speed and power of a wheel. Although technically in a branch of carpentry, the millwrights learned to work with metal as well. Metal was superior to wood not only because of its strength but because wood parts were irregular in motion and wore out rapidly. So iron and brass parts came to replace wood and leather parts.
In 1728, J. Paine got a patent for rolling iron instead of hammering it. The iron bars, being heated in a long hot arch or cavern passed between two large metal rollers, which had certain notches or furrows on their surfaces.
Around 1740, clockmaker and Quaker Benjamin Huntsman was struck with the difficulty of finding finely tempered steel for the springs of his watches and pendulums of his clocks. He experimented for years to find a homogeneous and flawless metal, and finally invented cast steel, which was much harder than ordinary steel. He did this by remelting refined high quality wrought iron bars at very high temperatures in sealed fireclay crucibles, together with small quantities of charcoal and ground glass as reagents. This distributed the carbon evenly in the metal, which hammering could not do. He approached the Sheffield cutlers, who finally agreed to try his cast steel for fear of losing their business to some other manufacturers who were approaching Huntsman. Since Huntsman had no patent, he worked at night and employed only men who would keep his secret. His steel was made at night. His factory became prosperous about 1770 and the excellence of his steel manufacture was never equalled. Steel and wrought iron was scarce and expensive.
Around 1748, iron founder Samuel Walker, discovered Huntsman's secret by appearing at Huntsman's factory disguised as a shivering tramp who asked to warm himself by the furnace fire. He feigned sleep while watching the whole process. When he began to make cast steel, his annual output grew from 900 pounds in 1747 to 11,000 pounds in 1760 and he made a fortune.
Silver was plated over copper from 1751. White metal from tin and antimony was used from about 1770.
The brass industry was beginning to produce brass from copper and zinc that was as good as foreign brass. The secret of plate-glass manufacture came to England in the 1770s.
In 1773, a corporation was set up for the manufacture of plate glass. It could raise joint-stock because of the great risk and large expense of the undertaking.
In 1775, chemist William Cookworthy was given a fourteen year patent for the discovery of certain clay and stone in England from which he made England's first true porcelain, i.e. that which could sustain the most extreme degree of fire without melting, and also had grain as smooth and lustrous, and the transparency and beauty of color, equal in degree to the best Chinese or Dresden porcelain.
The import duties on diamonds, pearls, rubies, emeralds and other precious stones and jewels was dropped to increase the business of cutting and polishing them.
The world's first chocolate factory was set up in England in 1728.