Understanding Arch Construction: Keystone and Voussoir Diagram #13318 (License: Personal Use)

This hand-drawn schematic illustrates a traditional voussoir arch composed of wedge-shaped stones arranged radially around a central axis. The dashed line points to the keystone-the final, topmost voussoir that locks the structure in place and transfers compressive forces outward to the abutments. Such diagrams are commonly used in architectural education and historic preservation contexts.

Used on educational pages about classical architecture, civil engineering fundamentals, or masonry restoration guides; targets students, architects, and DIY builders seeking foundational knowledge of load-bearing arch mechanics.