Straight Line Engine Governor Small 320×271 Medium 640×543 Large 1024×869 Download Tiff Original 2400×2036 | (552.1 KB) Description A straight line engine governor illustrating the direction of the ball (B) is going. The single ball is rotated around by spring S, spinning the wheel. The valve closes as the wheel spins. Keywords steam engine, Steam Engine Fuel Regulator, steam power, Straight Line Engine Governor Galleries Machines Parts Source: Derr, Louis Cyclopedia of Engineering (Chicago, IL: American Technical Society, 1911)