The 240 ton hammerhead crane lifting a gun mounting on the Promontory, Portsmouth Dockyard, Hampshire

An RP10 Mark IV 4.5" gun mounting hovering over the Park's of Portsmouth low loader number 45, hauled by lorry tractor unit CTP 224, parked on the Promontory, No. 3 Basin, Portsmouth Dockyard, while being lifted by the 240 ton hammerhead crane. The photographer is looking at the rear starboard corner of the turret. The light cruiser glasgow (1936) is alongside the Promontory under refit.