November 1884, he [Keely] states "I have the only true system of aerial navigation. My air-ship will be operated by the vibratory lift and the vibratory push process." [December 16, 1884 - Keely Bearded in His Den]
See Also
air-ship
Air-ship model
Figure 19.17 - Keelys Air-ship
Gravity
Levitation
propeller
17.15 - Theory of Vibratory Lift for Air-ships