Paris: Librairie Universelle, 1908. Soft cover. Item #39742
Translated from the introduction; "The problem of air navigation is to provide an apparatus that can sustain in the middle of the air and heading at will through the atmosphere in which it is immersed." 276 pages with photographs and illustrations. Small tears at the head of the spine and half inch chip at the base have been professionally repaired. A very good plus copy. Never read as pages are unopened.