This series contains images that were originally in frames, as well as oversized images and slides. Many of the images were used to illustrate Fowler's text on airplane flaps. In addition, there are photographs and lithographs of commercial airplanes that incorporate the use of the Fowler flap. There are also approximately 150-35mm slides depicting aircraft and aircraft models from WWII to the 1960s, as well as a caricature drawing of Fowler riding on an airplane wing model.