Aircraft Armament Past And Present, Part 2. Gun Turrets, Machine Gun Sights And Cannon. P/b, 14 x 22cm, 15p. Published by Real Photographs Co Ltd. Wartime publication with information on the early WW1 ring and bead sights to the Norman Vane sights. No mention of 'Reflector' sights which would have been top secret at the time! It also covers some gun turrets and cannon firing guns. Illustrated throughout with photographs and diagrams. Good condition. Stock code P20572.