1CHAPTER V Ballooning in the Great War
9CHAPTER V Some of the Problems the Inventors Had to Solve
2CHAPTER I Development of the Dirigible
10CHAPTER VI Famous Allied Airplanes
3CHAPTER II Forerunners of the Allied Dirigibles
11CHAPTER VII German Airplanes in the World War
4CHAPTER III Dirigibles in the World War
12CHAPTER VIII Heroes of the Air
5CHAPTER I Early Experiments with Heavier-than-Air Machines
13CHAPTER IX The Birth of an Airplane
