If you visit London the Science Museum http://www.sciencemuseum.org.uk/objects/motive_power/1861-46.aspx http://www.sciencemuseum.org.uk/objects/motive_power/18

If you visit London the Science Museum http://www.sciencemuseum.org.uk/objects/motive_power/1861-46.aspx http://www.sciencemuseum.org.uk/objects/motive_power/1861-46... has Boulton & Watt engine on display, which is worth a look. It is the oldest surviving Watt beam engine to have survived almost complete and unaltered, and was the first to be fitted with the centrifugal governor.