42 Faber, Henry B. Military Pyrotechnics; the History and Develop 
ment of Military Pyrotechnics. 3V. Washington, D.C., GPO, 1919 
1:17 
43 Ibid., p 24 
44 Same as Reference 38, p 59 
45 Laufer, Berthold, The Prehistory of Aviation 
71