ROYAL AIR FORCE RADAR, 1939-1945 (CH 15332) Chain Home: WAAF radar operator Denise Miley plotting aircraft on the CRT (cathode ray tube) of an RF7 Receiver in the Receiver Room at Bawdsey CH. Her right hand has selected the direction or heightfinding and her left hand is ready to register the goniometer setting to the calculator. Copyright: © IWM. Original Source: http://www.iwm.org.uk/collections/item/object/205196699