Boulton and Watt's bell crank engine, 1802.
© Science Museum / Science & Society Picture Library
Drawing. James Watt (1736-1819) was a Scottish engineer and inventor who was at the forefront of the development of steam engines. In 1774, together with his busines partner Matthew Boulton (1728-1809), he established a manufactory of steam engines in Soho, near Birmingham.