Travels in space; a history of aerial navigation (1902)
Valentine, E. Seton, Tomlinson, F. L. · London Hurst and Blackett · leaf 272
t of birds, which may be divided intothree distinct kinds, flapping, steering and soaring.Of these, the one demanding the least expenditure of A HISTORY OF AERIAL NAVIGATION. 253 energy is soaring, and investigation showed that under certain conditions flight is possible, if the windpossesses a… … LILIEXTHAL AND HIS FLYING MACHIKE. corresponds exactly with that which is observed in thewings of birds.* Lilienthals flying machine consisted of a correctlycurved surface, whose area was about fourteen squareyards, made by stretching linen over a light woodenframe. Its weight was about forty…
Aeronautics
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