Photos and Drawings from: To Caress the Air – Book One

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 Photos and Drawings from: To Caress the Air – Book Two

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6-Herring's twin cylinder opposed gasoline engine on test stand (1897)_ Meiller_Herring Collection.
25-Wright glider with dual fixed rudders (1902)_ 1903 Journal of the Western Society of Engineers.
book two

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Lilienthal's double-decker (1896); 1904 (Feb.) Independent Magazine.