Instruction on the Fortification of Cities

Here is a sketch of how much this pau likely refers to a structural element or bay becomes narrower at the top compared to its base. It also shows how the thicknesses of the walls and the bay widths between them uniformly unite with the base below.

An architectural or technical diagram illustrates the geometric tapering (diminishing) of a building's structure from its base to its top.

The upper half of the drawing is a rectangular elevation divided into ten rectangular bays (five across and two high). The lower half is a semicircular projection, possibly a plan view or a foreshortened perspective, divided into radiating segments. These segments contain smaller rectangles and triangles that reduce in size as they move toward the center, demonstrating how the Feldweiten bay widths and Mauern walls narrow.

A vertical center line bisects the entire diagram. The drawing is labeled with several letters:

• p at the top-left corner.
• m at the top-right corner.
• s at the left end of the horizontal diameter line.
• e at the right end of the horizontal diameter line.
• f at the bottom of the central vertical axis.

There are faint perspective construction lines visible on the left side of the page, indicating the geometric method used to create the drawing.