2026-09-28T02:21:17+01:00https://marinefinds.org.uk/datalabs/terminology/object/format/jsonhttps://marinefinds.org.uk/datalabs/terminology/object/format/xmlhttps://marinefinds.org.uk/datalabs/terminology/object10476140357PICKETT HAMILTON FORTYA sunken, circular, concrete pillbox used on airfields. They remained flush with the surface to permit the free movement of aircraft but, if attack threatened, could be raised hydraulically or by a counterbalance, and manned to give covering fire.1P