Wooden Model of a Steam Engine Governor

Long wooden drive shaft with a shorter shaft that has a wooden ball on one end, attached to a central valve mechanism. The valve mechanism has two hinged arms. At the end of the drive shaft nearest to the ball are four fused discs that decrease in size. At the other end is the valve stem. The valve starts fully open at zero speed but as the balls rotate and rise, the valve stem is forced downwards and closes the valve.