Regulator layouts, hood details for the Mark 3 and 4 Director for High Angle Control System (H.A.C.S.), targeting systems for the anti-aircraft guns aboard warships, the folder includes drawings for weather shield details by Aldridge & Ranken Ltd

The folder contains c 20 paper, blueprint and waxed linen drawings of regulator layouts, hood details for the Mark 3 and 4 Director for High Angle Control System (H.A.C.S.), targeting systems for the anti-aircraft guns aboard warships, the folder includes drawings for weather shield details by Aldridge & Ranken Ltd and a general arrangement of a shell. Drawing number range P15000 - 15003.