Elastic Spiral Wing
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An illustration of an “elastic spiral wing, which twists and untwists during its action, to for a mobile helix or screw. This wing is made to vibrate by a direct piston action, and b a slight adjustment can be propelled vertically, horizontally or at any degree of obliquity.” -Britannica, 1910
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Miscellaneous Bird IllustrationsSource
Encyclopaedia Britannica (11th ed., vol. 10) (New York, NY: The Encyclopaedia Britannica Company, 1910)
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