Seaplanes NC-1, NC-3 and NC-4 of the U. S. Navy starting the trans-Atlantic flight from Rockaway.
The NC-4 on its victorious trans-Atlantic flight, sixty miles at sea | Frontispiece |
| FACING
PAGE |
| Montgolfier experiment at Versailles, 1783 | 10 |
| The first cross-channel trip | 11 |
| Diagram showing the main features of the spherical balloon | 16 |
| Cocking's parachute | 30 |
| A German Zeppelin | 31 |
| Inflating a service balloon on the field | 40 |
| Army balloon ready to ascend | 41 |
| Giffard's airship | 54 |
| Santos-Dumont rounding the Eiffel Tower | 55 |
| Baldwin U. S. “Dirigible No. 1” | 66 |
| The British Army “Baby” dirigible | 67 |
| Cross section of the gas bag of the Astra-Torres, showing method of car suspension | 70 |
| “The Blimp,” C-1, the largest dirigible of the American Navy | 72 |
| The balloon of the U. S. S. Oklahoma | 73 |
| Diagram showing the essential parts of an airplane | 95 |
| Wright starting with passenger | 98 |
| An early Farman machine prior to start | 99 |
| Wright machine rising just after leaving the rail | 114 |
| An early Wright machine, showing its method of starting from a rail | 114 |
| The propeller department in one of the great Curtiss factories | 115 |
| A photograph of northern France taken at a height of three thousand feet | 138 |
| An airplane view of the city of Rheims, showing the cathedral | 139 |
| Diagram of an internal combustion engine cylinder, showing principle on which it works | 157 |
| This photograph shows the relative size of the giant Caproni bombing plane and the French baby Nieuport, used as a speed scout | 170 |
| The Spad, the pride of the French air fleet | 171 |
| A Handley-Page machine tuning up for a flight | 182 |
| The launching of a Langley, a giant bombing airplane | 183 |
| Side view of a Sopwith triplane | 187 |
| An American built Caproni airplane | 188 |
| This Curtiss triplane has a speed of one hundred and sixty miles an hour | 189 |
| A giant Gotha bombing plane brought down by the French | 198 |
| German Fokker plane captured by the French | 199 |
| Captain Eddie Rickenbacker | 218 |
| The first bag of mail carried by the U. S. Aero Mail Service | 219 |
| A photograph made ten thousand feet in the air, showing machines in “V” formation at bombing practise | 242 |
| A group of De Havilland planes at Bolling Field near Washington | 243 |
