Fig. 5. Kitchen's doughnut of 1911.

A compass rose diagram showing the reported directions of flight for UFO sightings, with counts for each direction and a summary of non-directional reports.

Photograph of a dark, teardrop-shaped object against a light background.

Photograph showing several dark objects and a fingerprint-like pattern.

Enlarged photograph of a dark, teardrop-shaped object, labeled Exhibit 'A'.

Photograph of a delta-wing or flying-wing aircraft on the ground.

Chance Vought XF5U-1

Fig. 11. Willoughby's "Delta 8" experimental monoplane of 1938.

Fig. 12. Experimental Hayden glider, 1925. Span, 19.7 ft.; length, 13-85 ft.; wing area, 173 sq. ft. All-up, weight, 310 lb. No lateral control.