RAF Operations Room Raid Block.

Incredibly scarce Raid Block used in RAF filter and sector Ops rooms during the Battle of Britain and later to display important information relating to an enemy raid. When details of aircraft were received at Group Filter room level it was interpreted on a map table with the raid block normally positioned at the head of the plotting path and providing information such as strength, height and whether the aircraft were 'hostile', friendly or unknown. Used in conjunction with the Sector clock this gave RAF controllers the ability to have access to up to date information to enable them to provide an appropriate response. More information of how this system work was contained in the secret RAF Air Defence Pamphlet No.4, extracts of which are shown in the images. Scarce item.

Code: 9380