Type 25 pillbox, Swanbridge, Sully

3D Model

The type 25 pillbox is the only FW3 design that is circular, with a diameter of 8 feet (2.4 m). The walls were just 12 inches (30 cm) thick with no internal walls. There were three embrasures suitable for rifles or light machine guns and a small entrance like a low window. This design was made from reinforced concrete shuttered by corrugated iron; this gave the design the popular name Armco after the manufacturer of the corrugated iron.