Type 25Horizontal section at the level of the embrasures. Pillbox Type FW3/25, horizontal section at the level of the embrasures. Note simple circular plan.
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 corrugated iron of that name.
The type 25 is rare, about 46 are recorded as extant.
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