Pontoon Bridge , Three Pontoons and Bridge Structure

 

This view shows all three pontoons, The two that are covered with white are covered with oiled cloth, the center pontoon shows the framework around which the cloth is wrapped and fastened. The bridge structure starts to the right: showing the heavy timbers on which the bridge rests. These are called baulks. Next are the planks laid across the baulks which forms the surface on which men and horses walk. These are called Chesses. Following these are the border timbers, which are there to deflect wagon wheels from going over the edge of the bridge, The baulks, chesses and border timbers are fastened to the pontoons with ropes. Nothing is nailed together.