Instruction on the Fortification of Cities

Here one sees depicted the layout of all the doors and embrasures that are around the entire structure, marked with their numbers so that one can identify them.

This technical architectural diagram shows the ground plan of a semicircular fortification or bastion. The structure is depicted with a series of straight wall segments forming a large semi-circle attached to a rectangular base. Small rectangular cutouts along the perimeter represent doors and embrasures. These features are numbered from 1 to 20 along the outer and inner edges. A central vertical axis is marked with the letters 'f' at the top (surrounded by a decorative loop) and bottom, and 'k' at the center point. Horizontal reference points are marked with letters 'l' and 'f' on the left, and 'm' and 'e' on the right. In the upper rectangular portion, two detailed drawings of windows with wooden shutters are shown.