Steam-powered Airship, Giffard 1852. Photo: Astonishing Science/Spectacular Museum.

Steam-powered Airship, Giffard 1852. Photo: Astonishing Science/Spectacular Museum.

Steam-powered Airship, Giffard 1852. Photo: Astonishing Science/Spectacular Museum.

Steam-powered Airship, Giffard 1852. Photo: Astonishing Science/Spectacular Museum.

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