Watt's Final Steam Engine Design
The illustration showing Watt's final steam engine design. The engine is fitted with series of rods to guide the in a straight line. James Watt and William Murdoch invented the throttle valve, centrifugal valve, regulator, and slide valve to improve on the steam engine.
Derr, Louis Cyclopedia of Engineering (Chicago, IL: American Technical Society, 1911)
Courtesy the private collection of Roy Winkelman