Using a Half Model to Design a Ship
This diagram shows how a half model is used to design a ship. This lift model is made of a number of lifts or layers of wood, pinned together. The model is then carved. After the model has its final shape, the model is taken apart and the lifts measured. Vessels designed this way are usually said to be modeled rather than designed.
This image is from Basil Greenhill and Sam Manning, The Evolution of the Wooden Ship, 1988, p. 91. Used by permission of the artist, Sam Manning.