text: In the Iron industry, coke was finally applied to all stages of iron smelting, replacing charcoal. This had been achieved much earlier for lead and copper as well as for producing pig iron in a blast furnace, but the second stage in the production of bar iron depended on the use of potting and stamping (for which a patent expired in 1786) or puddling (patented by Henry Cort in 1783 and 1784).  Using a steam engine to power blast air to blast furnaces made higher furnace temperatures possible, which allowed the use of more lime to tie up sulfur in coal or coke.  The steam engine also overcame the shortage of water power for iron works.  Iron production surged after the 1750s when steam engines were increasingly employed in iron works.
  These represent three 'leading sectors', in which there were key innovations, which allowed the economic takeoff by which the Industrial Revolution is usually defined. Later inventions such as the power loom and Richard Trevithick's high pressure steam engine were also important in the growing industrialisation of Britain. The application of steam engines to powering cotton mills and ironworks enabled these to be built in places that were most convenient because other resources were available, rather than where there was water to power a watermill.