Type 25
Horizontal 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.
Read more about this topic: British Hardened Field Defences Of World War II, FW3 Pillbox Types
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