How the James Watt improved the steam engine?

James Watt improved the steam engine produced by Newcomen and patented the new engine in 1781. His industrialist friend Mathew Boulton manufactured the new model. But for years he could find no buyers. At the beginning of the nineteenth century, there were no more than 321 steam engines all over England. Of these, 80 were in cotton industries, nine in wool industries, and the rest in mining, canal works and iron works. Steam engines were not used in any of the other industries till much later in the century. So even the most powerful new technology that enhanced the productivity of labour manifold was slow to be accepted by industrialists.