SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY
Pedal-powered vessel, 19th-century artwork. This vessel has two helical screws either side, powered by pedals operated by four cyclists, with a fifth seat at the front for the pilot. A variety of water-based cycling vessels were developed in the late 19th century. Artwork from the 19th volume (first period of 1897) of the French popular science weekly 'La Science Illustree'.
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