Airframe van het North American (Noorduyn) AT-16ND 'Harvard' IIB lesvliegtuig met registratie B-175 en constructienummer 14-765 ontdaan van alle huidbeplating en vleugels. Mortier in stelling tijdens de vliegdemonstratie te Andir, 30 Mei 1939. Variometer Aerial Aerial navigation, Maps and compasses Exploitation of aerial photographs Aerial mapping photography Aerial Navigation, Radius of action Aerial Navigation radio aids Maps, Aerial Photographs and Aerial Navigation history of Aerial Warfare Aerial navigation War in the air : aerial wonders of our time