1Aeronautical Classes, No. 5. Royal Aeronautical Society’s publications.

2Aeronautical Classes, No. 5. Royal Aeronautical Society publications.

3This list it as given by Wilbur Wright himself.

4Century Magazine, September, 1908.

5Aeronautical Journal, No. 79.

6Aeronautical Journal, July, 1908.

7Smithsonian Publications No. 2329.

8Fourth Wilbur Wright Memorial Lecture, Aeronautical Journal, Vol. XX, No. 79, page 75.

9Ibid. page 73.

10Ibid. pp. 91 and 102.

11Airships Past and Present.

12Hildebrandt.

13Hildebrandt.

14Hildebrandt. Airships Past and Present.