Ponton-bridge.
a. side view of ponton; b. end view of ponton joists, flooring plank and timbers fastened upon flooring to keep it in place; c. plan of pontons; d. plan of flooring joists; f. plan of flooring boards, with timbers thereon, near side of floor, to keep it in place.
Ponton.
Ponton.
Raft Complete.