ClipArt ETC
An illustration of a dredging boat (right) and a derrick (left). A derrick is a lifting device composed of one mast or pole which is hinged freely at the bottom. It is controlled by lines (usually four of them) powered by some means such as man-hauling or motors, so that the pole can move in all four directions.

Dredging Boat and Derrick

An illustration of a dredging boat (right) and a derrick (left). A derrick is a lifting device composed…

An illustration of a ship chandlery. A ship chandler is a retail dealer in special supplies or equipment for ships.

Ship Chandlery

An illustration of a ship chandlery. A ship chandler is a retail dealer in special supplies or equipment…