<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 ( 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>
who developed the steam engine that could drive machinery
who developed the steam engine that could drive machinery
James Watt
James Watt