Bridge composed of a boat, with extensible end sections that can be rolled out if the boat is not as long as the water is wide; additionally, the doubled-over end sections can also be unfolded for extra length.
Mechanics: roller guides.
Ramelli, Agostino. “Plate 195: Bridge for Crossing a River or Moat.” In Le Diverse Et Artificiose Machine Del Capitano Agostino Ramelli. Paris, France, 1588. https://digital.sciencehistory.org/works/6w924c17b.
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