Matthew Boulton and James Watt went into business together in 1775, to sell the improved steam engine that Watt had developed and patented. Ambitious though they were, even they could not have predicted just how long the firm they founded would last, or just how far-reaching their engines would be. The final incarnation of the firm, which was called James Watt & Co., finally closed in 1895, and by that time Watt engines were operating across all the continents of the world. Watt engines were used for anything and everything - pumping water out of mines, powering textile mills, blast furnaces and forges, tobacco, snuff and medicine factories, coin minting machinery, metal-rolling mills and sugar cane-crushing mills, and driving dozens of steam boats. Clients came to Soho from all over the world. Each of them had different needs, and several different types of engine were made at Soho to meet those needs. Boulton and Watt and their engineers had to be sure to match the right sort of engine to their clients' needs...