ROYAL AIR FORCE: CENTRAL INTERPRETATION UNIT / ALLIED CENTRAL INTERPRETATION UNIT, 1941-1945. - Flight Lieutenant H H Williams demonstrates the Wild A5 'Stereo-autograph' plotting machine to press visitors at Medmenham, Buckinghamshire. A vital piece of photogrammetric equipment, the Wild A5 produced accurate maps from stereoscopic pairs of photographs, and was in constant use at the CIU and ACIU throughout the war. , Royal Air Force, Central Interpretation Unit, Allied Central Interpretation Unit

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