https://creativecommons.org/publicdomain/zero/1.0/ https://www.rawpixel.com/image/429660 Electric Helical Aerostat Driven in the Air by Albert and Gaston Tissandier. Original from Library of Congress. Digitally…

Electric Helical Aerostat Driven in the Air by Albert and Gaston Tissandier. Original from Library of Congress. Digitally enhanced by rawpixel.

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