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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31-William Avery prepares to be towed aloft in Chanute's modified 1897 Herring glider at the St. Louis World's Fair (1904). Wikipedia-public domain.