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.