The cardboard templates must be cut, one for each half-section, as shown in the body plan, Fig. 67.
There are three of them,—the sheer plan, the half-breadth plan, and the body plan.
On card-board or stiff paper, mark a series of patterns of the different sections shown on the body plan.
A division in the middle (cutting it in two parts, so that you can see the whole circumference) may suggest to you the body plan.