Travels in space; a history of aerial navigation (1902)
Valentine, E. Seton, Tomlinson, F. L. · London Hurst and Blackett · leaf 325
ter and activity. 3. Selection of the instrument to obtain propulsion. 4. The form and kind of apparatus for sustainingthe weight—whether flapping wings, screws, or aero-planes. 5. The amount of the sustaining surface required. 20 306 TRAVELS IN SPACE. 6. The best materials to be employed for… … \ > i THE SANTOS-DUMONT NO. 1. 9. The starting up into the air under all con-ditions. 10. The alighting safely anywhere. Safety in start-ing, sailing, and alighting is essential. No one can doubt that the problem of maintainingequipoise is the most important and difficult one thebudding aerial…
Aeronautics
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