List of Plates
| Figure No. |
Page | ||
| Army airplane gliding to North Island Over U. S. Cruiser “San Diego” | Frontispiece | ||
| 1. | Congressional Medal awarded Wright brothers | 33 | |
| 2. | Ascent of sounding balloons at Avalon | 34 | |
| 3. | Meteorograph which made the ascent of July 27, 1913 | 35 | |
| 4. | First flight of airplane carrying two persons | 36 | |
| 5. | Sub-station at Mount Wilson Observatory | 37 | |
| 6. | Type of airplane used in 1911 on North Island | 38 | |
| 7. | Discussing a flight | 39 | |
| 8. | Captain Culver and parachute for determining wind-direction | 40 | |
| 9. | Lieutenant Gorrell, U. S. Infantry, as observer | 41 | |
| 10. | Point Loma from the eastern shore of North Island | 42 | |
| 11. | San Diego, across Spanish Bight, from U. S. Aviation School, at twilight | 43 | |
| 12. | Instructor Brindley and Meteorologist Carpenter in Military Tractor No. 50 | 44 | |
| 13. | Military Tractor No. 50 | 45 | |
| 14. | “Trimming” Tractor No. 50 | 46 | |
| 15. | Military Tractor No. 50 just before leaving the ground | 47 | |
| 16. | San Diego harbor at over two thousand feet altitude | 48 | |
| 17. | San Diego viewed from an altitude of thirty-five hundred feet | 49 | |
| 18. | Military Tractor No. 50 viewed from the ground | 50 | |
| 19. | Flying Squad’s Wind Direction Pennant Tower | 51 | |
| 20. | The Aviation School Motor-Boat “Pronto” | 52 | |
| 21. | U. S. Aviation Field at three thousand feet altitude | 53 | |
| 22. | Repair Shop, U. S. Aviation School, San Diego, Cal. | 54 | |