| The NC-4 flying-boat, showing the arrangement of the
motors | [Frontispiece] |
| FACING PAGE |
| Observation balloon about to ascend | [10] |
| The Wright flyer after the epoch-making flight at Kitty
Hawk, N. C., December, 1903 | [20] |
| A Shortt “pusher” seaplane equipped with a one-and-a-half-pounder
gun | [32] |
| British-built Curtiss flying boat, at Brighton, England | [32] |
| The Farman “Goliath” contrasted with a Farman “Mosquito” | [56] |
| The huge four-motored Handley Page bomber | [64] |
| The Martin bomber | [84] |
| The pathfinding aerial mail flight, New York-Cleveland-Chicago | [144] |
| The reconstructed De Haviland biplane, showing the
limousine accommodations for passengers | [146] |
| Diagrams showing an “aerial skid,” “tail slide,” and the
“spinning dive” | [154] |
| The so-called “Immelman turn” | [156] |
| Diagrams illustrating the reversal of position effected by
a “loop” and the execution of the so-called “Immelman turn” | [158] |
| Interior view of the Graham White twenty-four-seater
aeroplane in flight | [170] |
| The Vickers-“Vimy” bomber | [200] |
| The C-5 leaving its hangar at Montauk Point en route to
accompany the NC’s on their trans-Atlantic flight | [202] |
| The R-34, the British rigid dirigible | [222] |