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Reproduction feathered helicopter toy; Sir George Cayley experimented by winding the shaft with string which was kept under tension by means of the bent whale bone bow. Releasing the bow caused the string to unwind, turning the shaft, thereby rotating feathers causing flight; Circa 1809 Image from SDASM Curatorial collection. Note: This material may be protected by Copyright Law (Title 17 U.S.C.)--Repository: San Diego Air and Space Museum

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Owner: San Diego Air & Space Museum Archives
Source: Flickr Commons
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