• Artificial flight may be defined as that form of aviation in which a man flies at will in any direction by means of an apparatus attached to his body, the use of which requires personal skill. Artificial flight by a single individual is the proper beginning for all species of artificial flight, as the necessary conditions can most easily be fulfilled when man flies individually.

    "The Romance of Aeronautics". Book by Charles Cyril Turner, Ch. VII Lilienthal and Pilcher, 1912.