<Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (July 2010) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (July 2010) (Learn how and when to remove this template message) </Td> </Tr> <P> The Watt steam engine (alternatively known as the Boulton and Watt steam engine) was the first type of steam engine to make use of a separate condenser . It was a vacuum or "atmospheric" engine using steam at a pressure just above atmospheric to create a partial vacuum beneath the piston . The difference between atmospheric pressure above the piston and the partial vacuum below drove the piston down the cylinder . James Watt avoided the use of high pressure steam because of safety concerns . Watt's design became synonymous with steam engines, due in no small part to his business partner, Matthew Boulton . </P> <P> The Watt steam engine, developed sporadically from 1763 to 1775, was an improvement on the design of the 1712 Newcomen steam engine and was a key point in the Industrial Revolution . </P>

Who developed the steam engine that could drive machinery