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.
Derr, Louis Cyclopedia of Engineering (Chicago, IL: American Technical Society, 1911)
2400×2036, 552.1 KiB
1024×868, 83.1 KiB
640×542, 43.5 KiB
320×271, 16.5 KiB