£100 - £140
17 interesting monochrome glass lantern slides of early helicopters, including suicidal looking Petroczy-Karman-Zurovec PKZ2 of 1918, Pescara No 3 of 1924 (3), Breguet Dorand gyro c 1932, 1920's-1930's twin rotor twin boom (2 different types ?), early McDonnell XHJD1 c 1945, rotor head drawings, drawings of late 18th century Cayley and 1870's De Groof ornithopter, etc. Average GC (2 cracked across, 2 corners only cracked). Collected by the vendor's father, a helicopter engineer. £100-140
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